Multi-tank busters should apply to the main tank in an alliance instead of a DPS

[Neihel]

Yea it's called picking up adds when they spawn and press the buttons that make the incoming damage less ouchie at the proper times. Then keep on top of rotation.

when you're off tank you should be number 1 on your party's aggro list on bosses so if the main tank dies you're next in line to tank the fight instead of a dps dying

Your job as tank is soak and mitigate damage for the party, but not to start aggro fights with other tanks.

we literally have a skill called shirk which you can use on any low emnity party member in an alliance, and you can wait for your opener/burst to be done before turning on your stance just don't burst with tank stance on as an OT
aggro management is part of the tank role, if you can't manage your own aggro and start aggro fights that's your fault