I do like the move for Maton, but it's the Rays, so he might be cooked if they gave up on him.
Butto is the guy that I'd love to see get a nice run in some leverage spots. He's got very good stuff and the influx of starters moving through the system, his home is most likely as a bullpen piece.
You've got Senga locked in, on top of guys like Scott, Vasil, and Tidwell that are younger and will be given shots at starting. Sproat is a big ticket piece you hope is an upper end of the rotation piece. You still have Peterson as a back end of the rotation player, and you know that Cohen will want to spend this summer to improve the staff. It wouldn't shock me if they try and bring Severino back.