With good healing power, there is no reason why you shouldn't be able to do him. You can easily skip some of the dispells by just no having disc on at that moment. For example, there is no point in having a disc running before the first dispell maybe.
If you take a warrior, with t8 disc, class ring, Dolgrem/ST ring, donor weapon, you already have 4 clickies + eventually small one like ZT ring. With the length of the fight, you should be able to have one going back active so that would make 5 or 6.
Also take into consideration that's he is rooted, so you can more easily switch tank for example.
Toons that are not in his range at first (and that don't cast) won't be considered as aggroed so won't take the dispell.
I got a guildmate that is doing him with all his toons and he doesn't have better gear than you Rude (besides SK bp ok).
When the dispell is launched, just make sure to rebuff fast your tank, that's all. He is doable without sune. For sure it helps, but it's ok without too. I can do it that way, though I can't do it, I think, buffless
