[quote

ost_uid0="Roll"]Then that would mean he would be changing the rules of life and death. The dead would be able to go everywhere, even to the living plain if he changed the rules. And making rules that only affect a certain party is unfair to the unaffected, so it's doubtful he'd even try changing the rules (since it could be the downfall of his career).[/quote]
No, he can choose who he allows to go. Remember, he's the lord of the afterlife. He can allow the DBZ warriors to return if he wishes, but if any of the SF fighters die, he can detain them, refusing to let them back. It's his choice, it doesn't have to be fair.