I suspected it so but this post confirms it. You just want to argue. You act like you don't get that football in and of itself is a "system" that operates within a set of rules and that system is not the system I'm talking about when I talk about QBs playing within a "system". I'm talking about the coach's "system" like Belichick's system or Tom Landry's system. It includes how that team drafts players and how a practice runs. A system QB has to have accuracy and efficiency or the system won't work. But of course you knew that and just want to be difficult. When you say "Manning", I had to ask myself which Manning are you talking about? That got confusing until you specified he was with the Colts and then the Broncos.
I suspected it is so, but this post confirms it - you just want to try and show you are brighter than others by going against the grain. You act like you don't get that QBs all have individual skill sets that can enhance a system, and whether a QB does that by "blood and guts" or "gunslinging" or by a superior ability to read defenses and understand situations and use whatever system he plays in to its best advantage all still amounts to the same thing.
And you act like you don't get that what people refer to by "bus driver" is a player who has some success simply by not screwing up within the system he operates in, rather than one that excels in it and elevates it by using whatever his skill set he has.
As for the nonsensical suggestion that I somehow think you are referring to football in general as a system rather than the offensive systems of individual teams, that's a pretty alarming comment because it takes a great stretch of the mind and a willingness to ignore whatever you don't want to acknowledge to come to that conclusion. Throughout this discussion I've talked about things like Manning playing in the Colts system, and then playing in the Broncos system, and Brady playing in the Pats system and all QBs playing within an offensive system established by their team. There really isn't away to miss that unless you are making an effort to for the sake of an argument
As for "Belichick's system", Belichick is a defensive coach by background. The "system" is the Patriot's system, that offensive coaches on the Patriots have developed and tweaked over the years and Belichick has signed off on. He may have had input n tweaking the system over the years, but he is not the architect or the play caller.