IMO, there is nothing to be gained by keeping Liberatore in the rotation. I am confident he will be transitioned to a reliever for next season. That said, May’s exit opened a slot and the Cardinals can decide between Dobbins and Mathews who gets the starts. There is no urgency to have them both in the rotation, but I would rather see Dobbins first. To be honest, I don’t think I would call Mathews up in September. Adding him to the 40 man this year looks like a mistake to me, although it may be hindsight.