I think every front office person has their own opinions on what makes a good QB. But most are wrong far more often than they are right. The so called reduced "learning curve" for pocket passers taking snaps under center at college did not help Todd Blackledge, JP Losman, Alex Smith, Rick Mirer, Dave Klinger, Todd Marinovich, Heath Shuler or Jim Druckenmiller. Hell they have had just as bad success with the guys with the big learning curve like Cade McNown, Andrew Ware, Joey Harrington, Akili Smith, Matt Lienart and Tim Couch. I think its unfair to target any college system with the failures of Ryan Leaf and Jamarcus Russell, but I think those two are the real rule to consider. Its the individual and not the system. Ryan Leaf and Jamarcus Russell both ran incredibly successful modified pro-style offenses, yet both were head cases. One was nuts and mean, the other nuts and lazy. Its really the person that matters.
Most of the guys that get to the NFL draft combine have the skill set to toss it in the NFL and see the field, but not all have the brainpan to do it.
As for anyone saying that its hard to learn how to play under center, I'd say to look at Brees, Rodgers and Rivers. Its not that hard, if the player has the ability, the head and the work ethic. Guys who have it, have it, guys that don't, don't. Sure, consider if he can learn the mechanics, but if he can't learn the mechanics, I suspect there are far more problems, like his arm strength, his size and his ability to run any offense.
I have lots of fears about Cam Newton, but a fear that he will not be able to take a snap under center and drop back a few steps is not one of them.