Guild McCommunist said:
I've been wondering the same thing personally, but that's beyond the point.
You could always just burn each game to two seperate discs.
I assume you're referring to the personally wondering as being beyond the point, and not the question itself. Oh, and thanks for the bit about what he could always do. Maybe a name change to Mr. Obvious is in order?
There's no reason why the game shouldn't work on a multi, even shrunk. But there's no point in giving further advice until it is determined if he has indeed ever been able to play a GC backup. His multi-game disc might be fine and he just needs to patch MIOS. Which I'm sure you already know.