If somebody dies, and their stuff is still under control of someone else, it stays there until the end of that specific game in the T4 games we play.
I like that.
Normal multiplayer rules are designed so a loser can
pack up his deck and go do something else,
but in T4 the pile is all one thing.
It'd make sense to me that when something hits the graveyard
after its original controller is dead that it should be RFG.
It also seems to me that permanents that were Memnarched
should go to their drafters graveyards when the Memnarch's controller dies.
Spelljacked spells should stay RFG.
it's not an official format, so there are no official rules.
It'd be nice to come up with standard rules, though.