Jordan Williams - Williams was second in the NCAA in defensive rebounding percentage last season, ranking behind only
Kenneth Faried and
Kawhi Leonard amongst realistic draft candidates. (Well, unless you count
Luke Sikma.) At 6'9/6'10 ish and roughly 250, Williams is rather caught between positions - he got into much better shape in his sophomore season, losing much excess weight and showing up rather trim, yet this also meant he no longer had NBA centre size. It didn't stop him from being one of the best collegiate rebounders, and rebounding normally translates, but the size advantage will become a size disadvantage. Williams also showed up with a sporadic jumpshot as a sophomore, after not having one at all as a freshman, but the same physical profile problems apply - Williams is simply not athletic, which is a problem on both ends when you're not quite big enough. He's a banger who will fight for the boards, work hard defensively, blocks a few shots, can occasionally post up, finishes, and is generally rather high IQ. But losing all the weight didn't make him any faster.
Nevertheless, he's not a whole lot less athletic than his namesake
Aaron Williams - at least, not during Aaron's latter years. And even in the athleticism-based NBA, rebounds are rebounds.