What you are saying reminds me of what the Bengals did with Jon Kitna. Found a smart veteran who was holding no angst regarding being a mentor.
Bringing back Brock is a better idea as a backup than paying for one of those guys. We're not trying to pay a guy who should be a bench QB big money because there is some upside to him. Nope. We're looking for someone who isn't that great, might be okay in a game or two, but who knows the game and isn't going to be picked up any time soon. Ironically, Sanchez could be our Kitna.