Yeah. There's obviously more to judging greatness than just winning
N Super Bowls with that many championship rings. How good is the QB at running the ball? Success & overall composure in the pocket when under pressure, as you mentioned. How good is their arm, their quality of short to long distance passing, number of interceptions during their respective Super Bowls, field vision (reading the other team's defensive strategy), field IQ, spatial awareness (gauging distance), foot speed, agility, and general athleticism of each QB, ball release speed, precision of their passing, timing, leadership, and so on. There's a lot of the same stuff that we judge in boxing and combat sports that applies, many factors to take into account in judging how "great" a QB is overall.
Brady didn't run the 40 very fast but I've seen slower. Here are his official NFL combine stats when he was drafted back in 2000.
http://nflcombineresults.com/playerpage.php?f=Tom&l=Brady&i=4732
I grew up watching the QB's you named and enjoyed watching them. However, Brady imo is on another level. If he wins a sixth Super Bowl with the Pats, and I do believe he has one left in him, then this discussion can still be had but it's going to be much harder for the rest of the pack to even be considered.