Chapman will not be in the rotation, he's a closer from here on out. He crushes the role and provides confidence every time he comes in late in the game, whereas if he's a starter you really don't know what you're going to get...and if you try him in the rotation for two months, it doesn't work out and he goes back to closer and has his confidence ruined, how stupid does the club look? When the strength of your team is a pitching staff that's won 97 games, you only change weaknesses....the closer spot is not a weakness. The fifth spot and a few bullpen arms are all that will change.
New back on topic:
Cueto, Latos, Bailey, Arroyo, Lohse? That's a crazy good rotation. The Reds didnt have Price when Lohse was last here.