Most guilds use the 3 tank method it gives max room for error
1st channeller: Dps warrior, rogue, druid can tank doesnt hit hard
2nd channeler: MT tanks gets in position for mag after its dead
3rd channeller: Any reasonable geared OT starts to hit harder
4th & 5th channeller: Good OT one chaneller MD'ed onto him and will need 2 healers at end. The channellers will heal each other a rogue should be interrupt duty on the 5th channeller while on the 4th.
The reasons for this are simple.
1) 3 tanks means more room for DPS in raid
2) Even if your raid is really slow on DPS you should have 3 channellers down by mag breakout only 2 healers are committed to holding up OT the rest should be on MT who now has Mag.
3) Keeps raid together and last few infernals in one area which is much easier.
edit: I should actually explain why the last 2 together.
Assuming you are geared at instance level and say just clearing kara the last channeller hits hard and it does a shadow blast like they all do. So you need 2 healers one to heal you and the second to keep that healer and the infernal CC lock and/or hunter alive. So if you tanked them seperated you would need a 3rd healer (possibly a 4th) for the 2nd last
channeller. So bringing the 4th and 5th together the extra damage can easily be covered by the healer so long as he is not trying to heal himself and the CC.
_________________
