He's a rotation guy. He's fine. It would be great to have a player like him. My only point is that he is probably not that great of an upgrade. He's never been part of a high level defensive team, and he has never anchored a defense. In most areas, he average or above average. The stats bear out that he's just not that different from Theis in on court production.
He's a bit more athletic and probably a bit more switchable. He's a little better rebounder. But Theis is probably a better helpside defender, screener, and shot-blocker.