I brought this up in a thread I posted. I don't know why they did not add him, it would have easily been another 4 weeks of content. Dregs promise or 6 dregs pride (the non exotic hand cannon) you got randomly from beating him that came with a burn.
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All the primary guns from skolas came with burns but he did not drop them much. I think I only ever received 3, an arc and a void hand canon and a solar pulse.
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Only one I ever got was an arc wolves leash