There are a lot of problems with your list but nice effort anyway. Seems like your ranking is mostly derived from what those rooks are putting up right now.
For instance, I am pretty comfortable in saying that Verlander, Cain, Billingsley will all be better than Papelbon.
Liriano, I can only imagine going down hill for him due to injuries. Anyway, off the top of my head:
Guys too low: Drew, Hermida, Marte, Quentin, Reyes, Pelfrey, Kemp, Hart
Guys too high: Liriano, Papelbon, Milledge, Weaver, Jacobs, Sanchez, Duncan, Bonser
"Think of how stupid the average person is, and realize half of them are stupider than that." ~George Carlin