New legendaries
I don’t have a definite answer to this but it seems likely that any new legendaries added to the game will use unique precursors. All of the current legendaries work that way. It stands to reason that any additional legendaries will work like that.
It is reasonable to expect new precursors will be associated with new legendaries.
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[Currently Inactive, Playing BF4]
Magic find works. http://sinasdf.imgur.com/
[Currently Inactive, Playing BF4]
Magic find works. http://sinasdf.imgur.com/