Peyton Manning and Brady definitely have it. You can see Brees as the take charge leader of the Saints. Rivers, before falling off the cliff, was a fiery guy who always had the team playing well (until the playoffs). Despite his past off field distractions, Big Ben is a gamer on the field. Even the new guys -- Wilson, RG3 and Luck. Just listening to them talk and you get a feel that they are relentless workers who can lift other players.
Sanchez just doesn't seem to have those qualities. Maybe he does, but we haven't seem them. The guy obviously works his ass off to be in top physical shape, but those other things like getting upset too easily or poor body language or not being a get-in-your-face guy -- just doesn't seem like a dominant personality. Most of the stuff we hear about Sanchez is how he's a nice dude and gets a lot of girls off the field.
The jets need to find, obviously a guy who can play, but someone with thick skin and a I'm-going-to-carry-this-team attitude. So needed for a QB, especially in NY