I just farmed him up about 2 days ago. Easier in terms of kills.. meh felt the same. I can't answer the question about how many can loot.. I can say it's just as much a pain as before and I don't know if having a group of people farming would make it anymore easy/hard as he randomly spawns in the place of an ancient spineclaw. I was told though, just after pre-patch launched, but someone also camping that I was not grouped with that it did work with 5 people. I haven't seen this person since so I can't confirm.