I'm not posting this pro or con, just for discussion:
From Pro Football Reference:
Similar players ([from the site]football stats just aren't descriptive enough to capture players' styles. So we have settled for a method that attempts to find players whose careers were similar in terms of quality and shape. By shape, we mean things like: how many years did he play? how good were his best years, compared to his worst years? did he have a few great years and then several mediocre years, or did he have many good-but-not-great years?)
Career Mark Brunell, Steve McNair, Terry Bradshaw*, Jim Kelly*, Troy Aikman*, Boomer Esiason, Roger Staubach*, Drew Bledsoe, Ken Stabler, Bob Griese
No indication on the page what the * means, but I left them in there.