let me get this straight? the so6p powers came from the juubi? wasnt he strong because he tamed the juubi? didnt he have the rinnegan when he fought the juubi? isnt the juubi's body the moon? i wont look up the pages but if u can ansa those questions u wud know dat the so6p was powerful in spite of not because of the juubi. even the wiki says that and i dont quote the wiki for nothing. for me itz manga manga manga n sometimes(sometimes) anime. the body of the juubi is sealed in the moon. the chakra of the juubi are the tailed beasts. completely separate of the so6p paths body and chakra. yes. the so6p gained immense power from becoming the first jinchu but it wasnt the jimchu's power that he passed on his sons... it was his
No sh!t dude. I am the last person you are going to try to ever try to teach about Naruto.. lol
First of all yes most like 98% of his power came from the Juubi's chakra. Think about it why would he not start or discover ninjutsu before he fought the Juubi?? hmmmmm yes after SEALING the Juubi he got the Rinnegan that gave him access to every single element including Yin and Yang Release. With all that, chakra, eyes, and his sensing abilities he would need nothing but his imagination to create whatever he wants(Creation Rebirth).
To answer your question on how he defeated the Juubi he was a Fuinjutsu Master who was very very efficient at how he attacked the Juubi. If he was anything like Naruto who fought hard, worked hard, and never ever gave up I could see him defeating the Juubi with all he has all the while creating the most powerful SEALING Justu ever(Yea youknow the one that Kurama thought was Rikudo's Seal??
And to kill everyone who thought Rikudo Sennin had the Rinnegan before he SEALED the Juubi, lets think about this.
HOW would Rikudo Sennin who only have about .00001% the amount of chakra of the Juubi would be able to outperform the Juubi who has probably had the Rinnegan for thousands of years.
I mean the only way that I can see Rikudo Sennin having the Rinnegan is if he used the Outer Path and released something from hell or something. With him not knowing that he couldn't control the Juubi's power even though he had a shared vision of the Juubi the only way he thought of to control the Juubi was to seal it in himself. That would be one interesting story but then it would add a sort of bad ass feeling to Rikudo that he is was human as well and made a big big big big mistake.