Can you imagine the absolute hell that would be for Zach? Finally getting out of a dysfunctional franchise and escaping NY, only to go right back to another awful franchise/team IN THE SAME CITY!
If the Dolphins feel that Tua may not play again, I think they should absolutely pull the trigger on Zach. Put him in a creative offense with elite weapons around him and see what he can do. Either you turn him into a guy that can be your next starting QB, or he still sucks and you tank the year and hope to land a good QB in the draft or use the pick to help you trade for one.
Win/win if you ask me. Skylar Thompson will lose you games, but there isn't that off chance you can untap is potential and turn him into a good NFL QB.