Fiedler?
He re-defined the term "bus driver".
As for being tough, Bledsoe is tough as nails, tougher than anyone I can think of except Brett "Vicodin" Favre. Drew Bledsoe won a game throwing deep passes with a broken index finger that required a pin. That's tough. He got up after each and every one of those famous 150 sacks and gave his backup not a single pass except in garbage time. The last time he was hurt, he was bleeding internally from a fluke hit to the abdomen which he almost died from. And talk about mentally tough, that same year he rode the bench with class while the team he almost died for replaced him with Brady. He did that because the team was WINNING. He still came off the bench to carry that team through the AFC Championship game with Brady injured.
Bledsoe holds the ball too long. Bledsoe often fumbles when he's sacked. Bledsoe has trouble with the blitz. Fine-- discuss these arguable points all you like, but don't question his toughness.