Thats the most recent picture of him in CI (tri series). You should've seen him in 1st ODI, got a huge belly. If he runs with that, he will only mess up his knees even more.Tbh he doesn't look out of shape in that photo.
A small imbalance can create a lot of problems for a bowler, even if it is muscle.
ya, a batsman can have a lil belly, but a pace man gotta be all fit. a bit of extra weight could cause problems. but no sportsman should have belly. specially in this lifetime.