What this argument fails to consider is that all three of those quarterbacks that you name ahead of Brady were also surrounded HOFers.
Manning had a HOF coach for 7 years, a HOF receiver for 11 years, and another soon to be HOF receiver for 10 years.
Montana had the greatest WR to ever play the game and a HOF head coach who designed a revolutionary offense.
Elway lacked support for most of his career and his numbers kind of reflect it…
The biggest takeaway is that nobody becomes GOAT without support, and to discount Brady for his support, despite being the most efficient QB ever, is a lame argument when the same scrutiny is applied to the others in the conversation.