What scares me goes back to my point before. He's felt like he's underachieving based on his skillset all that way from Junior year of HS. Gabbert's big positive right now is not turning the ball over. He doesn't lose you games. I can't make a great defense on any of those other guys but they've all had far more success in their entire football careers IMO. When you start to look at the whole, I start to scratch my head.
The other part is, of those guys you listed, they all have serious doubts about being franchise QB's. Tebow certainly is not. Sanchez neither. Freeman isn't someone I hate but I wonder. Stafford is probably the one who certainly is. Newton has the head issues. Ponder....not sure what I think anymore. Not super promising but has found ways to win. Locker has a ton of talent but not shown a lot, much like Gabbert but not as much playing time. It's not exactly a list of guys I would be dying to be included with outside of Stafford.