False. Kaguya =/= Juubi.
The first time Kaguya did not become the Juubi's jinchuriki.. No clue where people get this crap from. She only ate the fruit. There is NO MANGA SCAN SAYING SHE WAS THE JUUBI'S JINCHURIKI.....
Rikudou's chakra and Juubi's chakra did merge... Thats why you get Rikudou's sword via being the Juubi's jinchuriki. And hence why Madara has the Senjutsu already like Naruto did.
1. Sasuke Attained Rikudou's Rinnegan chakra. There is a special chakra in Sharingan user's brains... that unlocks and gives power to the eyes ..... Sasuke attained that Eye chakra
2. Naruto's senjutsu that he attained = Juubi's chakra that Madara and other juubi's jinchurikis have.