As usually, a good solution to pseudo-corpses is an in-game solution. Have a few RSoPs visit the guy if he exaggerates. OR give him the chance to sacrifice his super-zombies (because note: corpses don't make skellies, AND even letting the corpse rot need not produce one, because the statue the corpse came from likely as not never have had any bones in it) in some last-ditch battle. He gets some fun and glory, but doesn't spoil anything because the encounter was never winnable.
The worst that can happen is that his party doesn't want to be around him anymore, and he gets to make a new character.
You can make skeletons from intact corpses, the flesh just falls off their bones. About whether the statue->corpse transition creates a skeleton or not depends on how you interpret the wording of stone to flesh, but I think that a corpse would have a skeleton.