re: What's at the root of the problem between Nick and Lane?

I really think much of it stems from the two men having different philosophies about play calling, at least situational play calling. I do view Kiffin as someone who can outsmart himself and get away from what's working (i.e. choosing the pass or run/pass laterally when they've been running the ball at will up the middle all game).

They also obviously have different personalities that compound their coaching differences.