With the new “emergency QB” rule, I think most teams will definitely be considering carrying 3. Cunningham could make the 53 and dress on game day, but not count against the 46 man active roster. The stipulation is that Mac and Zappe would both need to get “injured” and ruled out for him to enter the game, but it’s still a valuable safety net and lets him still be there holding the clipboard and learning. Over the course of the season, who knows, maybe he elevates to QB2. He would also be a depth WR and ST player if injuries hit those positions, and they could choose to activate him on some weeks as a gadget player if the game plan that week calls for it. There are a lot of little ways that keeping him makes sense, both short term and long term.