Kabr went down alone, I think. The only other possible partner is Osirirs, who is part of the Warlock Raid Set Gear too, but I think their paths were separate. Kabr was a Titan, so he was resourceful. He was clearly able and intelligent, as he fashioned armour from dead Goblins and Hobgoblins. Also, what happens after the Vault of Glass would be so confusing it might as well be 1,000 years in the past or future. Also, the Hunter Raid Set Gear has no character linked to it, so that either means an anonymous Hunter went in, or all Hunters are really good at building stuff.