Deathgod, can very well be.
In my opinion RDS is an Uzumaki jutsu and I still go for the Hagaromo's brother being the father of the Uzumaki (helping seal the juubz) and continuation of the Hyuuga linage (Kaguya).
Kaguya sinned by eating the fruit, so she can't be the juubz/fruit.tree, or only part of it(and I doubt it). Seeing that it's both evil, both her mind and body would stay behing. So I like your hun po incorporation.
I think her essence transmigrated into her sons somehow, or in theirs... and through Ashura into Bijuu and so scattered eventually. Then her essence was put together again through the Gedo and Juubs... being tree + chakra into juubs into jin, into summoning and so into tree/fruit.
So her hun did not become the tree/fruit/ nor juubs, but the three functioned as a container.
But hee... it's not like Kishi will ever explain this... lolz
Repped!