Just to play devil's advocate (and it's a bit of an aside, as I agree he's probably stronger, obviously leaner, and likely quicker), some post players benefit from having... uh let's say... a bit bigger derriere as it helps them create space when working with their back to the basket. Which of course Niang is as good doing if not better than facing up. I remember this was part of Jared Sullinger's game.
I don't expect Niang's production to go down in any way shape or form - quite the opposite - but I will be keeping an eye on that aspect of his game.
Again, I'm playing devil's advocate.
Fizer's backside had its own zip code, college defenders didn't stand a chance getting backed down by that dump truck.