Atlanta, I do think Fromm was the most important player on UGA's 2017 offense. Not the best. But the most important. Same for every QB who played for Saban.
The QB always is.
No other position handles the ball every single down. The center touches the ball every down, sure, but it's a quick snap and gone. Same basic motion every time. No decisions required normally, just muscle memory.
The QB, though, receives the ball from center, then...does something with it. Often, what he does with it isn't decided in advance, the QB is making split-second decisions. And even if there's no option built into the play, the QB still has to react to conditions, adapt and adjust based on what he sees, hears, and feels going on around him. All while holding that inflated piece of leather. If he hands it off quickly to a running back, sure, he didn't do a whole lot more than the center, but contrast that to a pass play.
And beyond all that, beyond the fact that he handles the ball every single play, so has the greatest direct impact on success or failure moving the ball forward, he is also almost always the one leading the other 10 lads. Directing them. Calling plays. Adjusting those plays based on the defensive front. Reminding his fellows what they're supposed to be doing, fairly often. Managing the play clock. AND the game clock. Communicating with the sideline.
All of this has been true since snaps stopped going to tailbacks and started going to quarterbacks instead. The past 70 years, or so.
Yep, most important position player on the offense. Pretty much always. By design.