I'm not a football guru by any means, but the way this was explained to me by Bama fans is that Bama, under Saban, has always run a two-gap technique while Kool prefers a one-gap so you basically had a philosophical coaching difference that just didn't mesh. I hate to call it an experiment, but I think Saban was trying something different and it didn't work so now he's wanting to return to the old way. Doesn't make Kool a bad coach, just a difference in coaching style that works in some places, and doesn't work in others. Again, don't quote me on any of this, but this is what I was told by certain people.