That's not being fired when a contract is not renewed. And you don't know if Sarah is the one who didn't want to renew it. It was Ailes who came crawling back to her according to her demands! They NEED her, she doesn't need them!
This is the food chain from top to bottom. NWO=Newscorp=Rupert Murdoch=Roger Ailes=Tokyo Rove=Sarah Palin
Sarah is not in a position to make demands of a powerful media elite joined at the hip with the GOPe.
They do not need Sarah all that much, if they did they would feature her on prime time.
They are using her and she has the opportunity to use them a bit as well.
Using her Twitter to expose Rubio, shows that she will not be muzzled by them, but ultimately boys like Ailes land Rove have all the power because they determine when and where she will appear on Fox News and what will be the general topic of discussion.
Tell that to Paula Deen. Otherwise, your post is on target. Fox's leftward move has been pretty obvious to even the casual observer so bringing back Sarah is throwing a bone to conservatives.