Arano suffered his injury, such as it is, in spring training though, so even in normal times I think they could finagle it. Or they could call him up for a doubleheader, put him in a low leverage inning, and if he can't pitch, move him straight to the IL.
I would agree Irvin gets the start tomorrow. Or maybe tandems with Rosso (who is now stretched out) which just makes it a bullpen game. Starting VV functionally means it could be one anyway. The 7 innings helps. Maybe Vinnie will surprise us.
They could also give Suarez the start if they think he's a better bet than Irvin. Doesn't help that Irvin's stretched out if he can't get to the 4th inning anyway.