now please combine ultimate sharingan of the juubi, with kaguyas byakugan and explain us why
ultimate sharingan -> rinnegan -> ems -> ms -> s happened.
I dont think the Byakugan had anything to do with the Chain of Sharingans you mention above. I think Derp has done a good job explaining that the Sharingan is caused by the Juubi's Ocular powers being diluted over time. It could, well... It is alot more complicated than this. If we understand what the eye represents, Yin, then it begins to make sense. Senju and Uchiha are counterparts in Yin and Yang. But its a bit deeper than that. Yin represents owns experience, ones soul. It represents an inward journey in discovering and relying on ones self. Yang on the otherhand represents the world as a whole, the physical realm and the other people who live in it. It is more of an outward journey relying on others around you. The more each individual relys on that intrinsic nature of their inner power the strong they become. Think about it.
Some of the strongest Uchiha, Itachi, Madara, Sasuke. Individuals who relied on very on their own power and strenght as oppose to others. Sasuke a lone Uchiha, Itachi a man stuck between his family and his clan with no real where to go, Madara the leader of a clan that betrayed him. We see that this characters over time grow to depend more and more on themselves and are rewarded with it.
On the otherhand Naruto and Hashirama are the exact opposites. They not only rely on but trust their comrades to a fault. Hashirama was ready to take his own life because he trusted those around him so much. Naruto is the same way. Hell Nagato greatest feat was shown when he put his life on the line to revive everyone in Konoha. Kushina suvived Tailed Beast extraction, a pregnancy AND managed to restrain the 9 tails within 30 minutes all because she was doing it for naruto.
There is a very interesting thing going on here, perhaps I will make a thread on it.