Like how that doesn't answer my question. So if I take a Rinnegan from someone who has it I could fully utilize it with just Senju DNA?
Probably, My theory is Nagato's eyes has both the Rinnegan and Sharingan. but without the Uchiha's dna in him, he could not revert back to the sharingan, thus permanent Rinnegan. So basically if you kill someone when there rinnegan is activated and pluck them out, while having Senju dna, is should suffice. Also make sure whoever you pirate from had everything they needed to obtain it (Rinnegan, Mokuton, Uchiha resets)