With Brissett as QB last season I think that Pats team would have won 6 more games.
Eagles (5 point loss) (difference in the game was a Jones pick-6)
@Raiders (2 point loss, ya it ended up being 4 points but because Jones took a safety at the end) (Jones interception inside the Vegas redzone)
Commanders (3 point loss) (Jones interception just out the Wash. redzone to end the game)
Colts (4 point loss) (lost on a terrible redzone pick by Jones)
@giants (3 point loss) (redzone pick by Jones that they returned inside the NE25 which set them up for their only TD)
Chargers (6-0 loss)
You can see a common theme in those close loses they had.
4-13 becomes 10-7
Think you could even argue 2 more games . The game in Buffalo (Zappe threw 3 INTs and it still was a 6 point game and stayed a 6 point game for the last 11 minutes) and the jest game (was a 9-3 game with less than 2 minutes left)
potentially 12-5 with better QB play.