I apologize if I'm derailing the thread, but the quote was "development can take place after college with someone like Purdy" in comparison to Cade. I guess I'm rejecting it out of hand.
Purdy is Purdy and that didn't change from college to pro. Some minor tweaks here and there, but it's not like he was drafted as a project (not developed in college) that has now become this pro machine. Purdy was drafted last because of his measurables - height, arm strength, etc. They're just not what NFL would like. On the plus side, he was drafted (at all) because he had experience, accuracy, good decision making and just has that gamer/it factor.
Cade would be drafted (if he's drafted at all) because he has measurables and good decision making. Iowa can't really take that away from him. They're not doing him any favors at all though.
I guess I'm saying that if you're making the argument that Purdy is a good example of development post-college, that's a really bad example. Honestly, it's a take that I'd expect for some national talking-head that never watched Purdy in college.
I'm trying to think of a college QB that was a project that turned out well and I'm coming up empty - probably because I don't follow the NFL all that much. I'd guess that other positions have more success at project players.