Smallest group needed to kill Kael in The Eye?

There is a video on YouTube of a DK soloing Kael, but some of my guildies 5 manned it easily the other night. I think they've even done it as a 4 man before but had some issues with their group comp.

One tank and one healer should be able to manage him together. Bringing dps will obviously speed up the whole thing, but you shouldn't really need any.

Two, one feral druid tank and one elemental shaman doing double duty as DPS and healer (with him in healing spec we didn't have sufficient DPS).

(Shameless self link to the post I made about it on my weblog, but I don't know of anybody else who's actually done this, and I actually explain the tactic we used in the post.)

It gets easier with gear - we one-shot it last week, with both of us having better gear than the post describes (the shaman is in avg. ilvl361 gear with a good handful of ilvl372 hardmode raid drops, while I'm still in blues but got a few upgrades). Armory links in the post may be broken since we're in the process of moving servers right now, I'll update them as soon as possible.

[edit] For the record, the mind control won't ever hit the target at the top of Kael's threat list. So if you solo him it's a non-issue, while if you two-man him your tank needs to be able to use daggers to break it.