Question: What Japanese mixed martial artist worked for the Dream organization in many of their promoted MMA shows?

full_context: Document 1: Ralek Gracie: Ralek Gracie ( ; born October 4, 1985) is an American Brazilian jiu-jitsu practitioner and mixed martial artist. As the son of Rorion Gracie, he is a member of the Gracie family, and the nephew of Legends of MMA Hall of Famer Rickson Gracie and UFC Hall of Famer Royce Gracie. He was awarded his black belt in Brazilian jiu-jitsu by his grandfather Hélio Gracie. He is also the founder of Metamoris, a submission-only grappling promotion.
Document 2: Rickson Gracie: Rickson Gracie (] ; born November 21, 1958) is a Brazilian 9th degree red belt in Gracie Jiu-Jitsu and a retired mixed martial artist. He is a member of the Gracie family: the son of Hélio Gracie, brother to Rorion and Relson Gracie, and half-brother to Rolker, Royce, Robin and Royler Gracie. In November 2014 he became an inductee of the Legends of MMA Hall of Fame, alongside Big John McCarthy, Pat Miletich, and Fedor Emelianenko.
Document 3: List of Dream champions: This is a list of champions in the Dream organization at each weight class. Dream is a Japanese mixed martial arts organization, originally promoted by Fighting and Entertainment Group, and over management of Glory Sports International since October 2012. The first two champions were crowned after the 2008 Lightweight and Middleweight Grand Prix, while the 2009 Welterweight and Featherweight GPs have crowned the champions at those weights. The 2010 Light Heavyweight Grand Prix crowned the first Dream Light Heavyweight Champion at Dream 16. The 2011 World Bantamweight Grand Prix crowned the first ever Dream Bantamweight Champion at Dynamite!!! 2011.
Document 4: Rodrigo Gracie: Rodrigo Gracie (born March 11, 1975) is a retired Brazilian mixed martial artist and Brazilian Jiu-Jitsu practitioner. A member of the famous Gracie family, Rodrigo is a 5th Degree Black Belt in Gracie Jiu-Jitsu and a Gold Medalist in the 1998 ADCC Submission Wrestling World Championship. While competing in PRIDE Fighting Championships, Gracie was ranked amongst the top Middleweight fighters from 2003 to 2004 due to an undefeated streak with consecutive victories over Hayato Sakurai, Daiju Takase, Yuki Sasaki, and Daijiro Matsui.
Document 5: Kazushi Sakuraba: Kazushi Sakuraba (桜庭 和志 , Sakuraba Kazushi , born July 14, 1969) is a Japanese mixed martial artist and professional wrestler, currently signed to Rizin Fighting Federation. He has competed in traditional puroresu for New Japan Pro Wrestling and shoot-style competition for UWFi and Kingdom Pro Wrestling. He has fought in MMA competition in the Ultimate Fighting Championship, Pride Fighting Championships, Hero's and Dream. He is known as the "Gracie Hunter" or the "Gracie Killer" due to his wins over four members of the famed Gracie family: Royler Gracie, Renzo Gracie, Ryan Gracie, and Royce Gracie. In particular, Sakuraba is famous for his initial fight with Royce, which lasted ninety minutes.
Document 6: Dream 16: Dream 16 was a mixed martial arts event held by Fighting and Entertainment Group's mixed martial arts promotion Dream. The event took place on September 25, 2010 in Nagoya, Japan. The event aired live in North America on HDNet.
Document 7: Roger Gracie: Roger Gracie Gomes (born September 26, 1981) is a Brazilian Jiu-Jitsu practitioner and mixed martial artist. A member of the Gracie family, he is the son of Reila Gracie (daughter of Carlos Gracie) and Mauricio Motta Gomes. Roger was awarded his black belt by his cousin Renzo Gracie at the behest of Carlos Gracie, Jr. whilst training in New York in 2003. He is currently a third degree black belt. Roger Gracie is the founder and head instructor at The Roger Gracie Academy located in Kensington, London, England. Notable Black belt promotions include Raymond Stevens (judoka), Nick Gregoriades & Kywan Gracie Behring. Roger is also an active mixed martial arts competitor and is the current ONE World Cruiserweight Champion.
Document 8: Dream 14: Dream 14 was a mixed martial arts event held by Fighting and Entertainment Group's mixed martial arts promotion Dream. The event took place on May 29, 2010 in Japan. The event aired live in North America on HDNet.
Document 9: Renzo Gracie: Renzo Gracie ( ; ] ; born March 11, 1967) is a Brazilian mixed martial artist and Brazilian Jiu-Jitsu practitioner. A member of the Gracie family of Brazil, Renzo is a 6th Degree Black in Brazilian Jiu-Jitsu under Carlos Gracie Jr.. He is the son of Robson Gracie, grandson of Carlos Gracie, nephew of Carlos Gracie, Jr. grandnephew of Helio Gracie, and the 1st cousin once removed of Royce Gracie. In mixed martial arts, Renzo has competed in the Ultimate Fighting Championship, Pride Fighting Championships, K-1, RINGS, and International Fight League (head-coaching the New York Pitbulls). He holds notable victories over five former UFC Champions: Frank Shamrock (UFC Light Heavyweight Champion), Carlos Newton (UFC Welterweight Champion), Pat Miletich (UFC Welterweight Champion), Maurice Smith (UFC Heavyweight Champion), and Oleg Taktarov (UFC 6 Tournament Winner)
Document 10: Kazuo Takahashi: Kazuo Takahashi, ring name Yoshiki Takahashi (born March 13, 1969 in Ichikawa, Chiba) is a Japanese retired mixed martial artist. He has competed in many large MMA promotions, including the UFC, World Victory Road, Pancrase, and Pride Fighting Championships. Takahashi is best known for his incredible toughness, heart, and will to win. He has fought many top fighters in mixed martial arts, including Masakatsu Funaki, Bas Rutten, Valentijn Overeem, Igor Vovchanchyn, Ken Shamrock, Vitor Belfort, Heath Herring, Semmy Schilt, and Josh Barnett. His nickname is "Cannibal Yoshiki".
Document 11: Kazuyuki Fujita: Kazuyuki Fujita (藤田 和之 , Fujita Kazuyuki ) (born October 16, 1970) is a Japanese professional wrestler, mixed martial artist and a former amateur wrestler. He has fought in mixed martial arts promotions including Pride Fighting Championships, K-1 and World Victory Road. He competes in mixed martial arts, shoot style wrestling and puroresu, and holds notable victories over Ken Shamrock, Gilbert Yvel, Mark Kerr, Bob Sapp, Karam Gaber, Peter Graham, and James Thompson.
Document 12: Hero's: Hero's was a Japanese mixed martial arts promotion operated by Fighting and Entertainment Group, the parent entity behind kickboxing organization K-1. Grown from and branched off of K-1's earlier experiments in MMA, including the "K-1 Romanex" event and various MMA fights on its regular K-1 kickboxing cards, it held its first show on March 26, 2005. The promotion was handled by former Rings head Akira Maeda. At a press conference on February 13, 2008, FEG announced that they discontinued Hero's and were creating a new mixed martial arts franchise, Dream, in collaboration with former Pride FC executives from Dream Stage Entertainment.
Document 13: Dream 13: Dream 13 was a mixed martial arts event held by Fighting and Entertainment Group's mixed martial arts promotion Dream. The event took place on Monday, March 22, 2010 at the Yokohama Arena in Yokohama, Japan. The event aired live in North America on HDNet.
Document 14: Dream 15: Dream 15 was a mixed martial arts event held by Fighting and Entertainment Group's mixed martial arts promotion Dream. The event took place on July 10, 2010 at the Saitama Super Arena in Saitama, Japan. The event aired live in North America on HDNet.
Document 15: Dream (mixed martial arts): Dream (styled DREAM in capitals) was a Japanese mixed martial arts (MMA) organization promoted by former PRIDE FC executives and K-1 promoter Fighting and Entertainment Group. DREAM replaced FEG's previous-run mixed martial arts fight series, Hero's. The series retained many of the stylistic flourishes and personnel from Pride FC broadcasts, including fight introducer Lenne Hardt. In America, the promotion is aired on HDNet. They promoted over 20 shows highlighting some of the best Japanese and international MMA talent, establishing or enhancing the careers of top ranked fighters such as Shinya Aoki, Gesias Cavalcante, Tatsuya Kawajiri, Ronaldo Jacaré, Eddie Alvarez, Jason Miller, Kazushi Sakuraba, Gegard Mousasi and Alistair Overeem.
ground_truth: Kazushi Sakuraba