Growing up in Big Ten territory and seeing tons of games, he's similar to Sullinger. Big bodied, undersized for a big in the NBA, very good production, not a leaper and has had weight issues.
I'm pretty excited for Swanigan at this point too, although I think he's played himself up from the second round to the late 1st, unfortunately. The comparison for Sullinger is obvious, although I'm going to guess that Caleb will weigh about 20 pounds less than Sully at the combine. He's definitely put a ton of work into his physical fitness the last several years, which I think will cause a divergence between their two career arcs.
Also, he has more range on his shot than Sully. He's a legit 3-point threat from college range, shooting 47% on a couple attempts a game this season. Sully went 40% from deep his sophomore year, but only took half as many 3s -- 3-point shooting is definitely in Swanigan's skillset more than Sullinger.
Let's see -- a thick PF who's an elite defensive rebounder, can shoot from 3, and is a decent passer? If he slides out of the first round, I really hope Ainge figures out a way to snag him.