I believe the idea was a game manager like Alex Smith. He is still under contract for at least next year (with a $32 million dead cap # if cut) and I don't think he will be available. Game managers could be Case Keenum or another Teddy Bridgewater. I just checked and Philip Rivers is going to be a FA next year. He would probably be a long shot but, with this defense, he would have a shot at a Super Bowl. Another option would be signing Mariota to a short-term deal and seeing if he could be a reclamation project.
Trubisky isn't going anywhere next year with a $9+ million cap # (all would be dead cap space if cut).
Foles is in his first contract year with the Jags and would have a $33 million dead cap hit if cut/traded. He's not going anywhere at those #s.
Peace