re: Different scenarios as to why Miles was angry during and after the LSU game

I think it simply was the fact that he knows Harris has crashed and burned, the kid is likely shot mentally, and as head coach, he knows that he is going to have to have a devastating (for Harris) conversation with him.

That type of thing is probably not Miles' favorite thing to do, with any player, and particularly the kid they've been trying to groom for the past several years. I doubt he really cares about whether "he's wrong and the fans are right", he probably hates to have to blow this kid's dream up.
Likely gonna give him a big speech about perseverance and overcoming adversity; although he probably already has, and now it's time to say "man, look, I'm sorry, but we just can't wait anymore. I want you to keep fighting, but we're moving on".

I think Miles already knows Etling is fine, the kid came in knowing he wasn't the number 1, and he was able to fight through it and produce when called upon.