No no no no no. And no some more.
Maybe with a mid-second, but no way a first. I've watched a lot of Hammons over his career, and there is a reason he never came out early for the NBA. There's a reason he was demoted to being a backup even this year for a bit. The effort is rarely there consistently. Sure he looks nice dominating Michigan's 6'9" (in shoes) center. But let's see if he gets to go up against someone like Poeltl in the tourney, and see what level of success he has.
Hammons is someone you don't want to give two years guaranteed to. He's very talented, but the work ethic just hasn't been there over a four-year stint at college, and there's little reason to believe it will suddenly materialize in the NBA.