Your estimate of 1.5-2 WAR loss for 150 LHP PA's from Ross was completely made up, and exaggerated. Besides, even if it were true that losing a backup catcher was worth 2 wins, what was the margin of victory in the AL East last year? It would have made no difference.
Hanrahan and Bailey were both awful in 2013, so their loss was a positive.
That means he's going to make a seamless transition. After all, he hit .321 in AA ball, so he's going to hit .300 as a 20 year old rookie in MLB.
Steamer - .261
Oliver - .269
ZIPS - .271
Keep your expectations lower. Also, if I'm making "enemies" on a baseball forum, that says more about you. You care too much about a game to let it affect you this much.