I got some time Saturday to work on this.
Did all of the bosses using 5 Druids except the last one. I called in a tank and downed the last one with 4. Got about 10 tries in him prior but ran out of time and just wanted the essence he drops.
Overall the rest of them are doable but the last one almost requires a few hunter pets or similar. If there is no one in melee range he will 1 shot your entire team. So you are able to do the mechanics without being next to him.
Hunters are just so amazing for multiboxing with the toolkit they offer. Just wish they worked in PvP!