Funny, you really need the yearbook to put some teeth in it. It just tell so much about a person who hasn't changed in twenty years. I'd say bro and dad are lying through their teeth.
In Thailand, Karr described the murder as a "blur". He uses "blurred" in his yearbook. It is a reference to "crying" and "bad things happening".
He also said that: telling about the "accident" (crime) would take hours. It was complicated. The note said that the pickup and delivery would be complicated, too.
Well, the pick up and delivery wasn't complicated. There was none.
And it wasn't an accident. It was a brief encounter with a tiny helpless girl. What kind of Victory could that be??
I agree, but I would add that if JMK is delusional or otherwise mentally ill, I won't second-guess his inaccuracies b/c it could be the result of that. OTOH, you're right; common sense says it doesn't fit. Without major physical evidence contradicting his OWN statements, he can't be the man.