that many orks, and without "human ingenuity" to take out ork hulks and stuff?
I'd have my money on the orks.
Once again, I'm going to have to mention mr. Brown, one of our resident local fluff-masters, who mentions that in some old fluff the imperial probes that are deepspace between our galaxy and others detect one thing: ork chatter, lots and lots of it, coming from all the galaxies they can pick up.
Also old ones made orks to never be wiped out, to that end Old Ones themselves couldn't get rid of orks once they took root. So even if nids does scour half the galaxy and CSM and stuff take the other half, orks will be somewhere roughing it out but never dying. |