You don't mark... and you realize how much TP a DPS party can burn through just mass AOEing... Im sry I don't agree with your strategy at all. As A tank I always mark needed or not, a focused burn is plenty fast than AOE spam simply cause focus attacks do more dmg. not only that if something goes wrong you can control fights properly, flash is pretty much useless after 15sec in an AOE fight cause it has such a small agro gain. Also by marking your directing your team and showing them kill orders and target ignores. Don't assume everyone can paly as well as you especially in Duty Finder, your just going to have a bad time.