And who does he replace in the rotation? Corbin or does dm go to a six man to save some young arms?
Its a pertinent question.
The problem is that Gray, Gore, and Irvin all need to get to ~175 innings this year. 6 pitcher rotation might preclude that.
Even more so, Cavalli is up in June, so you might end up with a six pitcher rotation then.
Tanner Rainey and Matt Barnes seem pretty DFA-able. You could always DFA one of them and put Corbin in the pen. Gives the Nats a legit long man option