Absolutely. It seems like you're cutting with a finer knife than I am. I do think that Mike Vick was, and still is, a developmental prospect/player. I don't remember Steve Young coming to the game, so I can't comment on that. All draft picks are developmental, but there's a threshold where there's only so much that a prospect can learn in the classroom and from the sidelines and throwing nine passes in a season, and they have to get on the field full-time. When I refer to a "developmental" player, I mean a player that's going to take 1-2 seasons to take the starting job.
The distiction that you make and I failed to mention was between "developmental" players and "project" players. Its one group inside the other, as far as I'm concerned. McCown, Pennington, Carter, Vick, Palmer, Carr, and Harrington were all developmental players, but I personally think that Vick, Palmer, Carr, and Harrington were at the threshold where getting on the field was the top priority. Vick and Palmer were kept out (Palmer altogether, Vick only for the vast majority of the time), but I personally think that they were ready. McCown and Pennington were held back, and I think that it did each of them some good. Carter and McCown were/are probably project players that need(ed) to be broken down and built up before they were ready to take the field. Personally, I think that thier respective front offices failed to do so.
There are also QBs like Rohan Davey, Kurt Kittner, etc. that are projects that will NEVER see the field. Pet coaching projects.
Essentially, I think that you don't think I make a distinction between developmental prospects and projects. I understand, I just will lump them together because it's like looking at a pile of oranges, and if some of them are navels, they're all still oranges.
You do bring up an interesting point: Which of the QBs in this class are ready to step in immediately? Eli Manning, obviously. I think Phillip Rivers, probably (his stats'll be worse, but he has all the tools). I think that Losman would be as good as McCown is now if he were forced to start immediately, but would benefit greatly from a Pennington treatment. Everyone else, including Ben R., would need at least a year charting plays on the sideline before they were ready to snap on the chinstrap.