When you see final product everything looks easy, preparation was really long, I was using different tactics with CC (which I in the end didn't use), how to survive first stuns, timing CDs (buffed adds were oneshotting with one of their skills) etc. I explained it in this topic that for this solo I was preparing from my Zon'Ozz 25m HC kill, it was idea of static buff on npc, which result in extremely high vengeance. But you are right, every kill in this game is about dps and survivebility.
We will see "Easiest" currently looks Tectus, but I really don't have idea how I will survive with 4+ beams on myself if I survive 1st and 2nd phase...