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I've actually gotten Titan to 3% in a Duty Finder group with the second tank being a Paladin with 4.2k HP, still in all his AF stuff.
That said, that was ONE group out of many, many groups and the usual group is just shy (not too far off) of breaking the heart, meaning you'll end up building a little LB so you can nuke it down.
This means more tumults which means eventually if your healers are "good" instead of "awesome," that you're going to fall once Titan's health is very low because the amount of tumults begins to overtake the amount of healing the healers can pull.
In short, while it's absolutely possible to do the fight in Duty Finder as is, the second tank's "value," is imaginary, really.
If all the DPS are able to dodge everything just fine, and your tank/healers are in-sync with cooldowns, the secondary tank is nothing but a waste of space.
The secondary tank is a fail-safe. If someone fails and tank dies, he'll pick it up. How utterly defeatist.
