I don't really have an opinion on who will land in town to QB. I have opinions on who I think it should be, but the Colts aren't going to listen to me.
My opinions: Fitzpatrick and Ryan too old for long term solution. Mayfield injured, no guarantee he'll recover from torn labrum(Luck didn't). Mariota also injury prone, plus I'm not a fan of running QB's in the NFL, they just don't last. My top two are Garopollo or possibly Winston. That's about as good as the Colts can hope for unless they trade for Brady for a year.