Interesting.
Whatever transpired, it seemed to be a rather abrupt ending, and this reporting would seem to corroborate that scenario.
Something must have really set PJ off, because this is the first I've ever heard of him chewing out a player for poor play. Maybe AK was a bit of a prima donna and didn't take correction or criticism too well. Maybe PJ targeted him unfairly. The answer is probably somewhere in the middle.
It is no fun getting your behind chewed out, but it happens to everyone at some point. While upsetting, it certainly is not going to kill you. The problem with some of these guys is they have been coddled their entire lives once someone figured out they could throw a football 70 yards on a frozen rope. Then the real world pays a visit and they crumble. Many times one or both parents will be heavily involved in solving their kid's problems. They never learn mental toughness because mom or dad are always there to bulldoze any adversity or criticism out of their way.
Being QB1 at a P5 school is a big responsibility. P5 football is also big business. Leaders either perform, or they are replaced. Nothing is guaranteed.