Rank these pitchers for the rest of the year WHIR

[islandflyfisher]

It looks like I am going to be able to trade Roberts/Weeks/a pitcher for Choo/Verlander.
Which pitcher would you give up?

Stats are WHIP, OBA, SV, W, K, ERA.

My Current Starters:
Johnson
Carpenter
Niemann
Latos
Marcum
Cahill

Obviously not Johnson/Carp, but who would you give up, given the choice?

[HighHeater]

Marcum is the worst, then Cahill, then Niemann

Latos, Johnson and Carp all rank ahead of Verlander

[mpieco]

I'd try to either place Cahill or Niemann in that deal. Marcum and Latos would be a bit too much for you to give up. I think Niemann is in for a fall, and currently has good-looking numbers, so he might be the best to place in that deal. I'm not sure if Cahill gets it done for you.