Rex, I'd keep him, you wouldn't.
But we both agree, Sanchez sucks. And you do not retain players who suck on a 30 % chance he might be salvagable in a perfect world in a perfect situation with perfect talent around him.
Why SAR, it's nice to find some common ground. As I've said all along, if you need a head to roll, I'll happily trade you Rex's for Sanchez's.