There is one video where someone has used 1 tank and 5 DPS.
There's several reasons to use 2 tanks:
1. PLD is actually really awesome at bursting Conflag's.
2. PLD has the best stun set for DKs.
3. Steadier add's.
4. Mediocre DPS allows you to have a buffer to fail somewhat and still win... with 3 healer DPS can't fail at all, with the 13m enrage.
Basically it makes the fight more consistent to use a 2nd tank. Its not really that much more safe than having a DRG or MNK tank adds, but you'll be able to kill them more reliably and its a lot more survivable so that you won't see any DPS "tanks" getting auto-gibbed which effectively could waste 10 minutes in your DPS tank drops during Snakes.
I will disagree with you however, swapping the OT for another healer is even more useless than having the OT. The only reason you even need 2 healers in the fight is due to Conflag and DK mechanics otherwise this fight would be potentially able to complete with a single healer. It still might be anyways but would require just a tad of luck to never have the healer inside either of those mechanics ^^;


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