In the Jets-Steelers game on Sunday, WITH THE CURRENT STEELERS OFFENSIVE SYSTEM AND O-LINE, what other NFL QB would have been able to do what Roethlisberger did?
This one is close to impossible to answer, as I suspect you are looking for a QB that on a handful of plays broke tackles, ran for first downs, and made a couple of timely short to intermediate passes ON JUST THOSE HANDFUL OF PLAYS.
It's not impossible, I'm looking for a QB who is ABLE to break tackles (consistently), run for first downs (when needed), and make timely throws (consistently), all while being under constant pressure because of poor performance by his O-line.
I would argue that in the other plays other QBs may have been more than capable or done better than Ben did across the entire game, especially given a 24-0 lead.
IMO, that would be a poor argument. Roethlisberger never took the field with a 24-0 lead. After the defense scored to make it 24-0, the Jets scored a FG. Roethlisberger took 1 knee with a 24-3 lead. To start the second half, the Jets scored to make it 24-10. The first meaningful snap Roethlisberger took in the 2nd half was with a 24-10 lead.In the second half, the Steelers ran only 25 plays. 11 of those were runs by RBs. That left 14 other plays. 2 were fumbles during the exchange with the back-up center. The 1st fumble looked to be Roethlisberger's fault, but the one for a safety was on the center (although charged to Roethlisberger). The ball never reached Roethlisberger's hands, it was snapped between his legs. Roethlisberger was sacked two times, and took 3 knees to end the game. He threw 5 passes in the entire 2nd half. He threw 1 INT, and completed 3 of the other 4 passes. ALL THREE of his completions were 3rd down conversions; he also ran for a first down (on 3rd down), to go along with 2 HUGE first down runs on the 1st TD drive of the game.
I don't see how these other QBs would have done better, seeing as how they would not have gotten many pass attempts, adn would have had to deal with the Jets defenders being in the backfield everytime they did try to throw.
So to your point, there may not have been a better option for the 5 plays that would would like to focus on, but there might have been plenty of better options on the other plays.
No, there wouldn't have been, not likely. The Steelers went into a grind-out-the-clock offense in the 2nd half, and that is their style. When they get up, they take their foot off of the gas and try to let the running game eat the clock, so these other QBs wouldn't have had more opportunities to make additional plays. Perhaps they would have throw 1 fewer interception, perhaps they would have completed 1 more pass. When you consider, however, that the INT came after Roethlisberger didn't have time to throw the pass when it was intended, and had to scramble to try to make the throw, I don't see Brady, Manning, Rivers, or Brees having much more success. It's more likely that they would have been sacked, and would have been forced to punt anyway (unless they converted a 3rd and long on the next play). In addition, those other QBs likely wouldn't have gained the 2 key first downs on runs during the opening TD drive, and the game may have been much different, anyway.
This is not to short Roethisberger, as he fits the scheme and the system as proven by the Steeler wins and titles. But I still think Brady, for example, may not have had to worry about getting sacked or scrambling by hitting guys on shorter routes. But that is even tough to project as the PIT scheme might not fit Brady as well as the NE one does.
The Steelers don't run those routes nearly as much as the Patriots do, so that option wouldn't have been as readily available as you seem to believe. Furthermore, if Brady would have been able to do that (in the Steelers system, with their poor O-line), why couldn't he do it in in the Patriots system, with their better O-line?
Some of this is hypothetical, since we haven't seen Rodgers or Rivers play the Jets, but we saw Manning and Brady fail when they played the Jets, so it seems fool-hardy to assume they would be successful, when they weren't.