Lord Vader not viable without Maul?

I think a cool thing LV should have the entire battle is a permanent Marked built into his kit. Kind of a “dark” version of GAS having taunt and it would be a permanent debuff on himself. This would free up the need to have Piett since marking LV is his main use. That way you could have Maul as well as say ST, Storm and RG as tanks that LV could stack their Mastery on top of his own to become ever tankier. Then he’d just need a way to up his own damage quickly… although we don’t know how much Maul will give him stat wise, he may be enough.