You cant just cherry pick the stats you want.
there is a VERY good reason back-ups "disappear", and that is the fact that there are only 32 starting spots.
You could say the same of Kurt Warner if Green wouldn't have gotten hurt. We wouldnt know who Kurt Warner (the QB) is.
it is my belief that there are numerous back-ups in the league that would be better than some current starters but because of lack of reps really puts them behind the curve. Would ee know who Brady is if Drew would not have gotten hurt? Dont be so sure!
back-ups usually dont get that 2nd contract either. So if they do get picked up by another team, they not only dont have real experience, but they now have to learn a new offense, team, etc. the odds are really stacked against MOST back-ups in this league.'
you cant just make a blanket statement... "they are back-ups for a reason". Its just not the case.
and the success by round taken is not anything unique, ALL positions track like that by round.
my point is, if teams didnt have 1/4 of their salaries tied up in their "starter", these back-ups would get more reps, more playing time, etc , which , in turn, would provide more quality QBs overall in the league. But the league doesnt work like that. QB is perhaps the ONE position that most teams dont provide as much depth as other positions. Its not because there are only 10 or 20 starter-caliber QBs in the league, its because thes backups arent getting developed properly (by most teams). And if you do develop a good backup, you will surely lose him in FA.,