Snell is just a fantasy, and i don't see the Nats making a play for Yamamoto even if they do go after pitching. Montgomery and Nola would be the most likelies. Severino on a 1 year deal would be interesting if we don't go for a longer term rotation piece.
Cavalli isn't going to be here until the second half of the year. I agree Irvin has earned a slot, so, short of a 6 man rotation, one of Williams or Corbin would be squeezed into the bullpen or, in Williams's case, possibly dealt as a swing man with a minor subsidy.
Hey, Slate - I'm surprised you aren't all over a Corbin to the pen move.