Question: What Japanese mixed martial artist worked for the Dream organization in many of their promoted MMA shows?
Context: "Wicky" Akiyo Nishiura (born August 8, 1983) is a Japanese professional mixed martial artist and kickboxer.  Nishiura currently competes in MMA for the DREAM organization as a Featherweight and has also fought for Shooto, Cage Force, and DEEP. 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. 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. World Victory Road (WVR) is a defunct Japanese Mixed Martial Arts (MMA) organization which promoted the Sengoku Raiden Championship (SRC) in Japan.  The organization was formed in 2007 following the purchase of PRIDE FC by Zuffa.  It operated in conjunction with the Japan Mixed Martial Arts Federation (JMM).  The Sengoku championship was broadcast on Fuji TV and pay-per-view in Japan, and on HDNet in United States. Cage Force(former name Demolition Octagon Gear (D.O.G.)) is a defunct Japanese Mixed Martial Arts (MMA) organization operated by Greatest Common Multiple (GCM) Communication.  It was the first Japanese MMA organization to feature an octagon cage instead of a ring.  Yushin Okami, Eiji Mitsuoka, Kuniyoshi Hironaka and Keita Nakamura experienced a cage match in D.O.G before contract with UFC.  It enforced the Unified Rules of Mixed Martial Arts when the changed name to "Cage Force" from "D.O.G.", to prepare Japanese MMA fighters for the UFC.  Cage Force tournament winner was entitled to a contract with UFC.  Yoshiyuki Yoshida and Takeya Mizugaki have been contracted to the UFC and WEC by winning the tournament. Shinya Aoki (青木 真也 , Aoki Shin'ya , born May 9, 1983) is a Japanese mixed martial artist and grappler currently competing in ONE Championship's and Rizin Fighting Federation's Lightweight division.  A professional competitor since 2003, he is noted for being the DREAM Lightweight Champion, ONE Lightweight Champion, former WAMMA Lightweight Champion and former Shooto Welterweight Champion.  Aoki is an A-class Shoot wrestler and BJJ black belt, both under his long-term mentor Yuki Nakai, as well as a black belt judoka.  As of 2008, Aoki, along with DEEP champion Masakazu Imanari, and Sengoku champion Satoru Kitaoka have founded the "Nippon Top Team" as a group of elite Japanese grapplers competing in MMA.  As well as his MMA credentials, Aoki has garnered several submission grappling accolades including two All Japan Jiu-Jitsu Championships, a Japan Open Jiu-Jitsu Championship, a Budo Open Championship, and an ADCC Japan Championship. 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. Dante Rivera (born August 12, 1974 in Manhattan, New York) is an American professional mixed martial artist.  He was a cast member of SpikeTV's "The Ultimate Fighter 7" making it to the quarterfinals where he was defeated by Jesse Taylor.  Dante Rivera is the owner of Danter Rivera Brazilian Jiu-Jitsu in Freehold NJ.  He operates a successful school with kids, teens, and adult classes.  Dante Rivera's MMA team is making big noise in the local MMA shows with his fighters winning most of their fights. Mohammed Shahid (born July 8, 1989) is an entrepreneur and a mixed martial artist from Bahrain.  He is the CEO of KHK MMA and the President of the Bahrain based mixed martial arts organisation, Brave Combat Federation owned and supported by His Highness Sheikh Khalid bin Hamad Al Khalifa.  Mohammed Shahid was the first mixed martial artist from Bahrain to compete in global MMA events.  He was assigned a managerial role to develop mixed martial arts in Bahrain as the CEO of KHK MMA.  Bahrain established a national team alongside bringing global talent to facilitate the growth of MMA in Bahrain. 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.
Answer: Kazushi Sakuraba