Mitch,-----I seem to get the sense that BA will not have anywhere near the trouble with the QB position that others here have had before him. I say that for several reasons.
First, he seems to be the kind of guy who breaks things down to simplest forms, then instills perfection by proper repetition of the skill set needed to get the results. From what he just accomplished with his first attempt at being a HC, albiet an interim one, he seems to have found the secret to getting the ball down-field in chunks instead of dink and dunk, and he knows that several things have to happen in order for this to happen. One of them is throwing out of play action, (which we almost never did).
He has said that a healthy QB with 'grit' is necessary. To that end, he has already said that he WILL produce an O-line that WILL learn the proper techniques of blocking, (be that for the run, or for pass protection). That is hugely different from what we have previously experienced. He has gone on record, (when asked by a media type during his presser), about who the O-line coach will be. He responded that there might be as many as three O-line coaches, or at least as many as are needed to teach and instill the PROPER way to block. He knows that all our QB's, (Warner included took a tremendous beating). I believe he first fixes that, and that he either gets it done with the players we already have, or sends them packing for younger, more prone to learning proper technique and habits, than what we have.
He also seems to know that all QB's can increase their accuracy, simply by adhering to proper technique with footwork and set-up to deliver the ball. I believe that ANY QB who has the determination to perfect his own bad habits is a strong candidate to succeed for BA, provided he has the necessary arm-strength, and 'grit' to hang in there and learn to be consistent with good throwing habits.
I believe that Skelton is a viable candidate in his eyes, provided he can fix his bad throwing habits. I also believe that Kolb has already shown him that he has the 'grit' that BA speaks of, and that if Kolb can clean up any bad throwing habits, (or reading habits when it comes to defenses), he too will be a viable candidate. I would also think that Hoyer, and to a lesser extent Lindley, could also become viable candidates. I would also suspect that, should he become available, Alex Smith who has already shown great improvement under Jim Harbaugh's tutelage, might also be a viable candidate. That guy is tough as nails, and most certainly has the 'grit' BA speaks of. If he is willing to put in the work to clean up his bad throwing habits, he might just excell in a system under BA.
I believe that BA has discovered that going back to basics is the secret to playing error-free football. I believe that he knows that if he can get the player, (no matter what position he plays), to buy into what BA's coaches are teaching, they will learn to do a few things VERY WELL; and that this will lead to "Cardinals not causing Cardinals to lose", whether that is blocking, tackling, throwing the ball, running routes, running the ball without fumbling, and without overrunning the hole etc. I believe this, because BA himself seems to believe in it, and has finally had the chance to prove this to himself and to the NFL with his stint as interim HC of the Colts this past season. I believe that BA just might do what Whiz wanted to do when he came here, but couldn't accomplish, because he either had the coaches who couldn't teach it, or he circumvented his coaches by extolling his key players to get their peers to fix the problems for him and his coaches. That ultimately led to the same players making the same mistakes week after week after week, without any real progress in how they played the game.
