I know this reply is late and also probably irrelevant at this point;

For that issue with Dranos I would just tell whatever group I was with to assume that Dranos was next to me even if it looked like he was elsewhere, because as Tank I do have agro on him. I farmed my Silken Ring motifs in there through random groups so you can imagine how much time I spent in that dungeon.. The other thing that ensured my survivability in that fight with him, was that while he visually wasn't where he should be, I could 100% trust his dialogue to tell me exactly what he was doing at every point in the fight. Just wanted to comment because after all my time spent in there, I just really love that dungeon!