The tanks wouldn't be the problem. Toth and Zorn, Vorgath, and Kephess would be the problems. You only need 1 healer on the tanks, because firebrand hits like a wet noodle even for wet noodle standards.
I don't see the issue with Z&T, as long as the derp is minimal on circles and fearful. Healing either side is considerably easier than healing Stormcaller side on F&S. I suppose I see the difficulty upping with each boss.
Still, hopefully someone has already given it a go. I'll probably try tomorrow in our second group.