Seems to me that it is typical of power conference teams and also the good mid-major teams to have players big enough to defend the rim at the 5.
Being able to meet dribble penetration by smaller perimeter players with a shot blocker and the ability not to get muscled down low are important components of winning teams.
As last season progressed deep into the ACC slate, it was my observation that opposing coaches recognized that Ndongo's quickness was a problem for them and they countered on the offensive end by posting him up with size. As a defender, he was less effective in that situation.
But Ndongo is quick off the floor and he hustles so as he progresses, he should project to improve as a weak side defender in the post, and be able to erase dribble drives at the five. But I expect that teams will continue to try to post him up and muscle him down low when we are on defense. At least that is what I would try to do, make him work really hard on the defensive end.
Because on offense, I expect Ndongo to be a headache for opposing coaches either at the 4 or the 5. His knack for using his quickness in tight quarters is going to be difficult to match-up against.