It's the Orkish Parking Lot vs. the Gargantuan Creature Horde!
The Gargantuan Creature rules contain an un-errata'd reference to outnumbering. I think that's a clear sign that the Apocalypse "Sit down and write more house rules" Rule applies, if you're either an Ork player or planning on using
GC's.
Because one of the other issues of contention (after the whole Ork Doom Blender vs. Bio-titan argument) is whether the automatic death from a failed Death or Glory falls under the "attacks that would normally kill a model" clause on page 91.