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They're not in a position to unceremoniously dump Iwakuma, though they can put him in the pen for awhile (apparently).
Obviously they love Erasmo and Noesi coming in with 93+ ammo.
They love Capt. Millwood as "veteran presence."
Beavan has done too well to have disqualified himself.
So that's 5 guys for 3 spots. Two of them go to the pen.
If you want Furbush as a second lefty, and Ramirez and Iwakuma make the team as relievers, then no room for Camp.
Seems like essentially he lost out to Erasmo.