Fiddle his entire career? Being a career back up, takes a special personality, someone willing to put the teams needs above there’s and be a model locker room guy for years at a time.
For all the reported studying and work that he puts in reality is he does not look like an NFL quarterback over the last two years. His only hope in my opinion is that someone like Andy Reid gets a hold of him or and he can go through a rehabilitation experience enough that someone would take a second chance on him as a starter. Personally, I don’t see it and I think Zach is out of the league in four years.