If Caleb can average 15 pts, 10 rebs, and an improved 3 next year he will be gone. Rebounding should be easy for him since AJ was such a big rebounding presence and now he's gone. I'm not sure Caleb will be able to make a massive offensive jump though but I hope he does because it would only help next years squad.
Basketball doesn't necessarily work that way. Your teammates help your stats. For example, teams keyed in on AJ so much - up to triple teaming him - which gave Swanigan more space. He REALLY struggled at times when a team had a competent defender on him, let alone when a defense will key on him (which will happen more next year). It also is the same idea for rebounding - on both ends (i.e. Hammons caused a lot of missed shots and rebounding opportunities because of his presence - something that's TBD next year).
Going into next year, he will be in tandem with a somewhat new partner with Haas (they played together last year, but obviously Haas will have more "brunt" of the minutes). And Haas is also a bit of a different kind of defender. This year, quite frankly, I don't think our interior defense was AS good as Hammons cleaned up a lot of Swanigan's mistakes. Swanigan definitely improved, but he's going to be more on the spotlight - on both ends - next year.
15 pts/10 rebounds/improved 3 is a LOT. AJ didn't even average those pts/rebounds.
And quite frankly, the actual points/rebounds weren't so much Swanigan's issue. His efficiency was an issue (yeah he got some good "points" games, but not really in a very efficient way many of the times). He led the team in turnovers - by a whopping 25!
He obviously wants 3 point shooting to be a thing, but the offensive efficiency and turnovers are his problems right now. He can average 15 points and 10 rebounds, but if he's turning the ball over 90 times and shooting under 50%, that's only going to get him so far....