As for P. Manning, the same story goes on and on, "because he's so good, winning it all just once is unacceptabel; therefore, he's a choker".
There is never hands-down winner in arguing greatest ever, but as one of the greatest, you can never get there being a complete choker.
This kind of leftover meal "opinion piece" gets tiring, coz it doesn't offer anything new or useful. The game is not a square-off boxing game, but rather played by 2 teams. If you rate TB's "clutchness" at 9.5, maybe PM is at 9.0, what's the big deal?