You're right. Brady sat behind Brian Griese for two years, in fact he was third string at that time, then won the starting job over Henson his junior and senior years.
I figured that it's time to give this guy his due. He is probably in the same mold as Joe Montana.
Greatness is subjective. But I think there are essential must-haves on most football fans' greatest QB list. Montana, Otto Graham, Elway, P.Manning etc.. Great leaders, with championships to their credit.
But my opinion, Brady is the greatest QB ever.. 6 conference championships, 4 Super Bowl titles. He's done it with a revolving door of receivers who were often virtually unheard of, and vanished after they left New England. He hasn't had a long-term Jerry Rice, Biletnikoff, etc.. no dominant running game to lean on. Granted he's had a great TE later in his career in Gronkowski..
Brady's pushing 40 yrs old, and is arguably still the best passer in the game; wouldn't surprise me if he wins another Lombardi. At this pace, I'm actually starting to feel Brady is becoming the greatest going away.