It's way too soon to put Lamar Jackson on this list, and I wouldn't include Warren Moon either, neither of them were 'clutch' in the playoffs. I would go with Norm van Brocklin and Ken Stabler instead, both were much better postseason performers.
Come on man, 1. No way Lamar Jackson on the list and warren moon is better than 19! 2. Steve Young should be... maybe , 19th. Then this happened, Drew Brees at 10 and Rodgers at 7 ?? Switch those 2 for sure.