Momota himself said he felt tired in second and third games and your solution is to increase muscle mass? Heavier players get tired sooner. Isn't your comment just overanalysing, based on one match? Last time Momota lost to Shi Yuqi he won the next match. In my opinion Momota is the favourite next time they meet unless Shi Yuqi is again given over 7 hours more rest after previous days match.