Question: In what year did the guest wrestling coach for person that many consider to be the greatest mixed martial artists of all time win a silver medal a the Summer Olympics?

Context paragraphs:
Kim Min-soo (judoka): Kim Min-soo (born January 22, 1975) is a South Korean former judoka, professional mixed martial artist and K-1 kickboxer.  He is best known for becoming a K-1 World Grand Prix 2006 Finalist and also winning the 1996 Summer Olympics in Atlanta earning a Silver Medal in Judo.  He is also known for his fights with current WWE professional wrestler and former UFC Heavyweight Champion and veteran Brock Lesnar, former WWE wrestler and K-1 fighter Sean O'Haire and former NFL football player turned K-1 kickboxer and New Japan Pro Wrestling contender Bob Sapp.  Min-soo holds a notable kickboxing win over former UFC fighter Scott Junk.  He announced his retirement from contact sports in 2011 with brief stints as color commentator for Japanese and Korean mixed martial arts and professional wrestling events.  Kim is also the Judo head coach for Korean Top Team.

Sara McMann: Sara McMann (born September 24, 1980) is an American mixed martial artist and former Olympic wrestler.  She is the first American woman in history to receive a silver medal in Olympic wrestling, which she won at the 2004 Summer Olympics in Athens, Greece.  She wrestled in the Women's Freestyle 63 kg or 138.75 lb weight class.  McMann won silver medal in the 2003 world championships and a bronze medal in the 2005 and 2007 world championships.  She started wrestling at the age of 14 in Marion, North Carolina at McDowell High School.

Jamill Kelly: Larry Jamill Kelly (born October 25, 1977) is an American freestyle wrestler.  He represented the United States at the 2004 Summer Olympic Games where he earned a silver medal.  Up until August 2010 he was the head coach of Dallas Dynamite Wrestling Club in Dallas, Texas.  In 2015, he became a guest wrestling coach for Daniel Cormier, Luke Rockhold and Cain Velasquez, all from the American Kickboxing Academy.

Anibál Nieves: Anibál Nieves Javier (born November 11, 1965) is retired male sport wrestler from Puerto Rico.  In college he wrestled for East Stroudsburg University where he achieved All-American status at the Division I level of the NCAA.  He twice represented his native country at the Summer Olympics: in 1992 and 1996.  Nieves also twice won a silver medal at the Pan American Games during his career.  After coaching stints at Springfield Technical Community College and American International College he became the head wrestling coach for Western New England University in 2007.  He currently serves as the head coach of the women's wrestling team at Springfield Technical Community College alongside his brother Alberto who serves as the head coach of the men's wrestling team at STCC.  He was a nine-time Puerto Rican champion.

Vivian Cheruiyot: Vivian Jepkemoi Cheruiyot (born 11 September 1983) is a Kenyan long-distance runner who specialises in track and cross country running, olympic champion in 5000 metres event.  She represented Kenya at the 2000 Summer Olympics, the 2008 Summer Olympics, the 2012 Summer Olympics and the 2016 Summer Olympics, winning a silver medal at the 5000 m and bronze medal at the 10000 m at the 2012 Olympics, silver medal at the 10000 m and gold medal at the 5000 m at the 2016 Olympics, setting the new Olympic record in 5000 m event.  Cheruiyot won a silver medal in the 5000 metres at the 2007 World Championships in Athletics and became the world champion in the event at the 2009 edition, repeating this achievement at the 2011 World Championships, where she doubled up by winning the 10000 m.

Cary Kolat: Cary Joseph Kolat (born May 19, 1973) is an American wrestler and wrestling coach who earned two NCAA championships in 1996 and 1997 for Lock Haven University of Pennsylvania and was a member of the United States Men's Freestyle Wrestling Team from 1997–2001.  During that time he won silver and bronze medals at the 1997 Krasnoyarsk and 1998 Tehran FILA Wrestling World Championships as well as competing for the United States in freestyle wrestling at the 2000 Summer Olympics in Sydney, where he placed 9th.  Kolat is currently the head wrestling coach at Campbell University.

Dan Henderson: Daniel Jeffery Henderson (born August 24, 1970) is an American former mixed martial artist and Olympic wrestler, who last competed as a middleweight in the Ultimate Fighting Championship.  He was the last Strikeforce Light Heavyweight Champion and was the last Welterweight (80 kg ) and Middleweight (95 kg ) champion of Pride Fighting Championships.  Additionally, Henderson was the Brazil Open '97 Tournament Champion, the UFC 17 Middleweight Tournament Champion, the Rings: King of Kings 1999 Tournament Champion and the Pride Weltwerweight Grand Prix Tournament Champion.  During his career, Henderson also challenged for the UFC Middleweight Championship (2x), the UFC Light Heavyweight Championship and the Strikeforce Middleweight Championship.  He was the first mixed martial artist to concurrently hold two titles in two different weight classes in a major MMA promotion.  At the time of his retirement after UFC 204, he was the oldest fighter on the UFC roster.  Known to be one of the greatest mixed martial artists of all time having defeated a total of seventeen MMA world champions across four major MMA promotions (UFC, PRIDE FC, Strikeforce, and RINGS).

Einar Liberg: Einar Liberg (16 October 1873 – 11 September 1955) was a Norwegian rifle shooter who competed in the early 20th century.  He won the gold medal with the Norwegian free rifle team at the 1908 Summer Olympics in London, and four years later at the 1912 Summer Olympics in Stockholm he won the silver medal with the free rifle team.  At the 1920 Summer Olympics in Antwerp he competed in running deer, and won two gold medals in team, running deer, single shot, and team, running deer, double shot.  He also took the individual bronze medal in running deer, double shot.  In the 1924 Summer Olympics in Paris he ended his long olympic career by taking another gold medal in team, running deer, single shot, and a silver medal in team, running deer, double shot.

Germán Sánchez (diver): Germán Saúl Sánchez Sánchez (born 24 June 1992) is a Mexican diver.  He is nicknamed "Duva".  At the age of 16, he competed in the 2008 Olympic Games in Beijing for the individual 10 metre platform and came in 22nd with a score of 399.35 in the preliminary.  He won one gold medal in the 2011 Pan-American Games.  He qualified to participate at the 2012 Summer Olympics by his performance at the 2012 FINA Diving World Cup where he achieved the silver medal alongside Iván García, to participate in both individual and synchronized 10 metre platform.  At the 2012 Summer Olympics in London, he won a silver medal in the 10m Synchronized Platform with his partner Iván García with a high score of 468.90.  In the individual 10m Platform, Germán Sánchez came the 14th with a score of 477.30 in the semi-final.  At 2016, Germán Sánchez took part in his third Olympic Games in Rio de Janeiro, Brazil.  In the Synchronized Platform, he and his partner Iván García didn't perform as well as 2012 and only came the 5th with a score of 423.30.  Twelve days later, Germán Sánchez came up in the final in Men's 10m Platform after ranking only 12th in the preliminary and 9th in the semi-final.  To everyone's surprise, he performed his best and won the silver medal with a high score of 532.70.  He became the third Mexican athlete to win an Olympic silver medal in Men's 10m Platform after Joaquín Capilla(1952) and Álvaro Gaxiola(1968).  He is also the only Mexican diver who has won Olympic medals in both individual event and synchronized event.

Daniel Cormier: Daniel Ryan Cormier (born March 20, 1979) is an American mixed martial artist and former Olympic wrestler.  He is the current UFC Light Heavyweight Champion, and is ranked as the sixth best pound-for-pound fighter in the UFC.  Cormier was also the Strikeforce Heavyweight Grand Prix Champion.  He is considered by many to be one of the greatest mixed martial artists of all time.

Supporting paragraphs: Jamill Kelly Daniel Cormier
Answer: 2004