I'm confused how people can think the arena league can prepare a QB for the NFL better than playing D1 college football can? How many QB's from the Arena league have even stuck on an NFL roster let alone be a star, Warner was very much the outlier in that regard.
Arena league is a totally different game, different size field, different rules, different everything. It helped Kurt because he got to throw the ball over and over and develop confidence, but he succeeded in the NFL because he had talent. People forget Green Bay wanted to keep Kurt, they just didn't have the numbers to do so at that time.
I agree with what Pariah said playing for Martz helped Kurt a lot, Kurt has told that story repeatedly Martz made Kurt become a disciplined QB, how to hold the ball how to release it, how many steps etc.
The very same stuff Whiz was doing with Leinart that confused him so much.
We'll see if it's the same with Hall but you get the impression the reason they like Hall so much is that he picks that stuff up quicker than just about any other QB Whiz has worked with?
Saying he'll be another Warner is complete guesswork, but I don't know that not playing in the AFL really matters. Grieb was a superstar in that league for years with the Sabercats, he couldn't get past tryouts with NFL teams, let alone get signed and survive OTA's training camp and preseason like Hall did.