As someone else posted above, Endor really had no relevance to the Galaxy at large until RotJ so discovery of the non-space-faring Ewoks would be incredibly difficult or uncommon. It -is- possible that somewhere in this timeline Endor is being explored for some weird purpose, but they would also have to explore the moon and would likely find even more primitive space-bears.

I actually think it's a bit more complicated than that, because if I recall correctly they mention blue perpindiculars and green parallels as well. I believe it is more like below: Parallel = "status good" Perpindicular = "status bad / conflict" Bisector = "conflict resolver" Blue = "us" Green = "them/others" Black = "third party" So a black bisector is someone not directly connected to one side or the other who steps in to help resolve whatever conflict is ongoing. I could be a bit wrong, but in my head this makes sense ...