@Gemina:

Bismarck EX: dps check on adds to survive ultimate
Ravana EX: dps check on adds unless you can burn right past them to survive ultimate
Thordan EX: dps adds (meteors) to survive ultimate
Sephirot EX: dps adds (light dps/heal check) to survive ultimate; later in fight, dps adds + wind + avoid mechanics to survive the phase.
Sophia EX: dps adds + split damage or sacrifice team member to survive ultimate. This is the easiest dps/heal check of all of the extremes at launch and I've still seen people fail it...

But you are correct, this has been the fixed pattern of Heavensward eikons.