If they offer all at once, no advantage. But right now, as we all understand, they haven't.
I think the fact SJR hasn't made any bids since round 3 is telling though. If Jassim/Qatar can make bids after the fact, I'm sure SJR could if he needed to.
He wasn't even able to improve his first bid simply bid the same for less shares. Right now it looks like Qatar is in the driving seat but really who knows