That photo someone posted on here about the Uber drive dropping off KFC wasn't a great look for him as a professional athlete.
On a serious side you do raise an interesting point. I've thought it could have a detrimental effect.
Typically you'd strip someone down to get more minutes out of them. That wasn't an issue. He was playing big minutes before. He paces himself well through a game.
The other thing is does he still have the same power? The extra mass does have some benefits in the oppostion have to move that bigger body.
Being lighter might help with his footwork before the line.