I know plenty of powerlifters who blast coke during training and during meets (and surprisingly not recreationally)
personally, I dunno how a guy would fight on coke... I'd think they'd be too 'scatter-brained' to stick to a game plan and end up looking like clay guida.
also, personally, I know plenty of mma guys who do a LOT of coke (friends and training partners of a top 3 ufc lightweight).... I just dont' see how it could help, even in the short term.
that being said, whether I think it'd help or not, I think that piece of shit Jones should be stripped of his title and suspended for a year just like they did to Diaz and have an interim title fight between cormier and gus. Jones has already had substance abuse issues in the pastand got a pass.