I don't doubt your understanding of the barrel roll. I am calling into question your apparent disdain for military pilot training. I am also questioning your need to criticise a guy who made a fatal error. I'm sure if you'd been there you could have taught him to do it better and we wouldn't be having this conversation.
I'm guessing that you are well versed in aerobatic manoeuvres from your handle. Are you equally well versed in fast jet handling?
Do I really need to continue?
BV