The way I have always Rped is that it goes Kaguya - Hagoromo - Ashura/Indra - New story.
I RP Rusaku being the descendant of Hamura's child, instead of the SO6P's kids. So, it seems this is where a lot of people's RP will differ. I truly don't care what we decide, I am just giving an example how I RP it. If ten tails does somehow come together, I will RP it as Kaguya. Of course without Black Zetzu, we won't really see Kaguya so I will never know if it's her or her mentally handicapped cousin.
If this is the future or not it really does not effect my RP. I often use the Toads from the Naruto-verse so I /guess/ my timeline is Shippuuden, but it really does not matter to me if it's 900 years in the future where DNA implanting is all the rage. Madara and Kabuto did it before it was cool and stuff #hipster. Real visionaries for Ninja fashion.
This week on project runway! Look at this cute little Shinobi sporting the faces of three different people on his chest. Oh, don't look now, I think he has a forth face on his bottom. Oh you go ninja!
....I get bored really easily >.> sorry bout that.