Jason Vargas, who started game 1 of the ALDS, does not become a #4 because you signed Edinson Volquez. If he's your #4, it's because Ventura and Duffy are 1 and 2, and Volquez beats him out for the 3. I think It's Ventura-Vargas-Duffy (2/3 are interchangeable if Duffy comes out of spring training in form) Volquez-JGuts.