Also Chael wasn't "technically" WEC champb ut he still beat Filho who was champion. Filho mailed the belt to him t acknowledge the fact he lost and that Chael was the rightful champ even if it goes down different on paper.
Despite what went on in Filho's life, Chael still won and beat the champ or a major org at the tim on th sam level as Bellator, Shooto and the others you listed. I agree tho, Chael is 100% an underachiever. BUT, he still beat a guy who was not only a world champ, he was a guy who many people rated OVER Anderson Silva during Anderson's early UFC run. Filho was the #1 guy in the world for a while.
I don't think QUest is on the level of teams like NU, BTT/Carlson, MFS and others as far as achievements. BUT, Randy and Hendo are two of the all time greats and won titles while there. ALL of Hendo's title and tournament wins (UFC tournie winner, too) came when he was at Team Quest. I'm not 100% sure what year Randy left Team Quest, but he was UFC LHW champion when he was with TQ the first time he won the belt.