While the only way for a team (not in LA or NY) to get an ace is to develop one, I think this is probably the best move. 1) I'm not sold that he has enough pitches to be an effective starter yet. 2) As another poster already say, we kept waiting for Meyer and Romero to build up their innings levels too. If it hasn't happened by the time he reached AAA, it's not a sign it's going to happen. 3) In an era of Andrew Miller, Josh Hader, and openers, there are more opportunities for innings. In theory, he could throw 70-90 IP as a reliever instead of the 50-60 standard of a few years ago.