There was a time when IT wouldn't be ruled OoOS at Professional REL, but it
sucked. I think it only took one feature match where someone, possibly
Patrick Chapin, unearthed a creature, attacked with it, then put it in the
graveyard, for his opponent to claim that he must have passed the turn, and
that was upheld.
The rule changed back pretty soon after that incident.
Remember there are very few tournaments held at Professional REL. There
are differences between how players are treated at the Pro Tour versus a GP
for instance. However, I don't think these are spelled out in the IPG,
perhaps because they come up infrequently enough to never really be made
into a flat out policy.
Paul Smith
paul@pollyandpaul.co.uk