Yes. ‘A’ QB. Not ‘one’ QB.
The Broncos went 4-12, 8-8, then Manning came in and they went 13-3, 13-3, 12-4 and 12-4, went to two Super Bowls and won one.
The Seahawks went 7-9, 7-9 in Carroll’s first two seasons, then Russ came in and they went 11-5, 13-3 and 12-4, going to 2 Super Bowls and winning one.
In both cases, the teams had ballers all over the gaff, they just needed a good QB.
I’m not sure exactly what superhuman quality you are trying to ascribe to Brady but I can’t roll with you on it I’m afraid.