It’s absolutely not Brady.
Matt Trashel went 10-6 without him after an MVP year. Brady is great and he’s the GOAT via his resume but he’s even admitted Rodgers would outshine him with the same system. Belichik is the GOAT coach and provides the biggest mismatch the Patriots have had for two decades.
People here don’t like hockey but the records Gretzky has are Wilt, Jordan, and LeBronesque. His name is everywhere. For a team sport, Wayne was probably better at hockey relative to competition than anyone else was in any other sport.
The honest answer though, might be Serena Williams. There’s no comparable to her in the field, run of dominance is unimpeachable.