i heard Kurt Warner on Dan Patrick show a few years ago and KW said he can teach anyone to properly throw a football and to be a qb, but what what he said and something no one can teach, and which is basically genetic, is the ability to comprehend and process everything that is going on is the quickest manor. as an example, most qb's are expected to get rid of the ball in 2 seconds or less so even if you are 95% of HOF TB12, that 5% difference means TB gets rid of the ball and another qb gets sacked. and imagine if you are only 90% of TB. if as a qb, it takes you .05 seconds longer to process something you are a backup qb. and that functionality within the brain cannot be taught. it's inherent. i am a high energy person sometimes and my brain works in microseconds and my reaction times are super fast. i can't teach you that, it's natural. so the S2, which i think 15 teams currently use, tries to extrapolate those processing times. Vince Young is a good example on the other side, he would just run because he couldn't process things quick enough.