Niang is a much better defender than people are giving him credit for. If he had Ejim's leaping ability, he'd be leaving for the NBA soon from Kentucky.
FIFY.
To those saying he won't improve offensively, I think I understand what you are saying, but I think he will improve in several ways. First off, conditioning. He plays really good offense at the beginning of halves, but can trail off after he's been on the floor for a bit. Second, he needs to figure out how to stay out of foul trouble. By his Jr year, he should be playing 30-35 minutes per game. Third, when he is an upperclassman, the offense will run through him much more than it does today, much like Royce last year. 2 apg is amazing for a freshman big, but I think he'll get that up to at least 5 when the offense is tailored for him.
The other place I think he'll improve offensively is knowing what shots to take when. Not that he has bad shot selection now, but I think it'll really improve. He can also be a more consistent rebounder.
I have quite high expectations for Niang, I think he could have a Fizer-esque career path. I think by his senior year he could potentially be a 20-10-5 guy. He has that much potential.