Board Thread:Versus Debates/@comment-26998824-20151026220137/@comment-17883740-20151028020155

Ishi208 wrote: You need to have a good relationship with your bijuu to snap out of it and Roshi had one of the best since he's been host to Son for about 40 years and can transform fully (and paritally). Roshi wasn't a perfect Jinchuriki and by the looks of things didn't even call Son by his name for like 40 years, which is the opposite of a good relationship.

Gengetsu wins as he specialises in Water Release, which is Roshi's weakness as he pointed out against Kisame.