If Andrew Miller could just harness a little control he would be an enormous addition to our rotation. Even with a 6.47 BB/9 in AAA, he's still posting a 2.47 ERA. To me, that translates to complete domination when he's throwing strikes. He's got a respectable 7.42 K/9 down there too.
Kyle Weiland is crushing the AAA competition as well. He's got a 3.10 ERA this year through 58 IP, while sporting a lofty 10.09 K/9 and a 2.6:1 K/BB ratio.
I know Miller is a project, so I'm ok with leaving him in AAA until he can refine his command, because when he does he's going to be dominant. As for right now, though, I'd much, much rather see us give the 5th spot to a guy like Kyle Weiland over Wakefield. He's a young kid with something to prove who can bring a spark to the rotation, and looking at it from a long term perspective, what better time to bring up a young SP than when you've got a team who can push 14 runs on any given night? Weiland could very well be a future starter for our team. Wakefield is just a bridge. Give the ball to Weiland.