If you study xûr you notice he has a warlocks bond, hunters cloak, and a titans marks. If you look closely at the mark you notice that it's an Osiris trials based mark. Does this mean that Osiris is part of the nine. Also does this make xûr a guardian like a master guardian who is skilled with all the subclasses I say this because he says that the cells remember so he's obviously been revived. So wtf is he.