Romano needs to learn a third pitch to be a starter and if he can work on it where the games don't count in the big league standings, I think he has a chance to be a solid middle of the rotation. Reed, I'd keep ready on regular turns as the 6th guy. Mahle is the guy who I think is ready for the big league lump taking and I'd keep him in the big league rotation and move on from Disco. I'd move on from Stephenson. Sims and Mella are OK for another year in AAA.
So, move on from Disco, Despaigne and Stephenson. Mahle as 5th starter. Wisler in the big league pen.
AAA rotation: Reed, Romano, Sims, Mella and Gutierrez. Finnegan and Stephens in AAA Bullpen.
AA Rotation: Santillan, Lopez, Moss and whoever