In a couple more months, there won't be *your* certificate. It will be one certificate. And if the ops are separate, the TA does not restrict which side of the operation the new airplanes go. Since we have several 180+ seat domestic markets out West that the 757 flies, chances are that those 321's will go to PHX crews.
I know your MEC will never tell you that, so I figured I'd fill you in so you didn't throw another tantrum when you expectations weren't met again.
I see the subtle sarcasm is lost on you once again. Not surprising.