The sad truth is that the Patriots have already made a BIG MISTAKE.
In March they said: let's sign an experienced, reliable back-up quarterback. He will:
1. Win us some games
2. Act as a mentor
3. Protect an inexperienced quarterback, especially if our O-line isn't strong
The trouble is that Brissett is so bad he won't win games. His inaccuracy and slow decision-making will lose games and hold back the development of the offense.
As for the other two things, $7 million will buy you a lot of quarterback coaching (and you've already got an OC, a QB coach, a special offensive coaching assistant and lord knows what else -- how many more people does Maye need breathing down his neck?). And, if you needed a crash-test dummy to play the position, you had Mac Jones.
If it were me, I'd cut Brissett tomorrow and go with the other three quarterbacks on the roster. If you don't think Maye is ready to start and you don't have any confidence in your O-line, start Zappe. At least he's better than Brissett.
But this won't happen because it would involve whoever pushed for the signing (AVP?) admitting he made a mistake -- and that won't happen in an organization where everyone is new and under scrutiny.