are not first round picks. They are 2nd, 3rd and 6th round picks. And outside of Peyton, look at all the highest drafted QBs this weekend ...
Every one of those QBs were drafted to teams that already had a starter in place. All of them were plan B's. Why? Because the draft is a crapshoot. It worked out for NE, SF and Seattle in these three cases but didn't work out for 95% of the other QB picks (I pulled that percentage directly from my ass) . The guy they drafted ended up beating out the guy that was the starter. Brady and Kap only got in there because of injuries.
None of those guys were drafted to be the next franchise QB. They had obvious talent which merited being drafted in the first place, but none of them were drafted to start. It just further proves the point that the draft is a crap shoot. Yes, every team should be drafting a QB every year but very few of those picks ever amount to anything.
So those three teams had their starter in place, and then drafted a QB to develop behind them. That's exactly what the Bears are doing. You are pointing to those three franchises saying they did it right, the Bears are doing it wrong, yet the Bears are following the same plan.
When you go into the draft desperate to land your next franchise QB because you don't even have a starter on the roster, you are far more likely to end up with Jason Locker, Christian Ponder, David Carr, Blaine Gabbert etc. than you are with Peyton Manning or Andrew Luck.
I don't think anyone is against getting the next franchise QB on the roster as soon as possible, but it would be dumb to not have a quality starter in place when you begin that search if it's at all possible.