NelsonsLongCatch
Cheesehead
Yes, that is impressive. However, it's not a good comparison to MM when MM was down to option number 4, not his back up.
That Patriots team was also coming of the 16-0 season and was loaded with talent so it wasn't all Belicheck.
EDIT: Belicheck also went 5-13 before Brady.
McCarthy was down to his "4th option" because the backup quarterback on the roster (Seneca Wallace) should never have been on the team (or in the league). He doesn't get a pass for keeping a horrible quarterback on the roster.