I ran a LoA yesterday for the weekly and needed on the royal robe as whm and got it. Later the crown popped and my need option was greyed out so I greeded on it. Today I farmed LoA again for light and whatnot and saw the only mnk in our party needing on the fuma feet, which he got, and then later he needed again on the fuma eyepatch and got that too.
It's the first time I ever saw the need option greyed out unless I had the piece already, and was surprised. Is this a bug? Or is the need option restricted somehow? How come I couldn't need twice in the same run but the mnk could?