Defining the greatest quarterback ever isn't as easy as it should be.
Some will point to John Elway's physical gifts and say he'd have been the greatest in a better situation. Many will cite Dan Marino and say he was the best pure passer ever. Aaron Rodgers gets mentioned as the most talented anyone has seen.
But at some point, results have to be the main driver of the argument. That's the one tangible thing to judge any quarterback on. And when a quarterback's resume is the criteria, there's not much doubt about who the greatest ever is.