Right now when you greed or need on one of the end game missions/raids you can't get another item for the rest of the week if you are able to aquire one. I recommend SE "seperates" Need from Greed so if you are able to Need something, you should still be able to greed an extra item and ofcourse the other way around. Why? Because a lot of us play with all classes at the same time on one character and one piece a week is kinda... pathetic...