Just because it’s savage difficulty doesn’t mean you need to have full set of savage gear to defeat it. You don’t even need that to beat savage tier. So it will be silly of the devs to make the item level savage gear set tier. I gather normal mode will be expert dungeon item level, extreme will be item level 600 like the Barby extreme fight and savage will be 610 item level like the savage fights. That’s my take on it.