Allen also has the most playoff wins out of that group as well, and would anyone take one of those other qbs over Allen to lead their team?
No denying he has made poor decisions with the football at times, but he's definitely not the most overrated qb.

Does any of those playoff wins have anything to do with their defense?

I think he's the most overrated. Every analyst gushes over him. He's still a really good QB but he can't get out of his own way