if he wants a second year on the o-a then he needs to re-enter before that expires as that is valid 1 year from issue. If he first came 1 month after the visa was issued to get a second year would require exit and re-entry after 11 months
actually i didn't say "how dare you question my advice". I gave my advice as far as I understood it based on reliable sources but was equally aware that conflicting advice would follow and that the OP would be none the wiser once everyone had posted
if you're going to question the advice you're given here (which you probably should) I'm not sure why you'd ask the question on here in the first place rather than go to an official site