I think you could claim legitimately based on whatever reasoning you like that Brady is the GOAT in all weather at this point. He has the credentials. It would be dismissed as homerism unfortunately because of the lost Super Bowls, but when you keep in mind that no Super Bowls except when Cowboys (GOAT team ;D) were involved were ever particularly close games until this decade, when suddenly a majority were close, you realize you have to use different standards for counting Super Bowl wins/losses - a lot of contextualizing, a lot of "having had to watch those seasons".
& I am not saying that Super Bowl wins are the only credentials of course - I think Brees and Rodgers have both been much better QBs than P. Manning or Brady ever were. But between Brady always beating Manning, Brady playing better in cold weather (it directly leads to more playoff wins, dome teams are much more likely to lose on the road in playoffs than any other teams on the road), the 3 extra Super Bowl appearances, and basically matching P. stat by stat since Belichick flipped defense first for offense first, you can argue it without "being a homer". People put Elway in their top 5 QBs list all the time because he appeared in 5 Super Bowls and his teams won 2, and he had as many INTs as TDs for the first 10 seasons of his career and threw implausibly badly in 3 of his Super Bowl appearances (123 0/1, 108 0/2, 257 1/3) including one of the wins.
