I don't suppose that any of the players who chose to leave (for more money elsewhere) will come back. I guess they can't really. I did wonder about Shotton though, and if he didn't get a contract elsewhere, if he'd come back here on less money - he seems like the sort of character who would knuckle down and get in with the job, even in that situation.
BTW - I'm certainly not suggesting that Shotton is amazing, but he generally did a decent job for us, and could be reasonably useful in the squad.