Indra is not a spirit. Rather, his power is due to chakra gene that all his descendent posess. Thus, there is no need to talk about someone being Indra. rather, it is about someone having Indra's DNA. Therefore, every single uchiha is a valid representation of Indra. This is how biological Indra is. It was even stated by the SO6P that Indra inherited his chakra gene.
On the other hand, we have got our answer to the Senju bloodline subject. We spent the entire lifespan trying to figure out who are the Senju and why hashirama was the only one who was special. Now, we know the reason. The special guy of the Senju clan is exactly Ashura reborn.
Unfortunately, though everyone know that every uchiha with Sharingan has Uchiha power, and that Uchiha need transplant eyes to grow, they are building a new denial because reincarnation seems cool. Thus, if I say there is no reincarnation of Indra, I will be bashed. However, can anyone answer this question:
Why would Sasuke be Indra reincarnated given that he would never have EMS without Itachi's eyes? Why would Madara be Indra given that his Indraness depends on Izuna's eyes?
My opinion is that Rikudo was human + god-like being. One of his children took the human side (biology) and the other took the god-like side (reincarnation).
good to kow
