Board Thread:Theories and Speculation/@comment-26388300-20150523085628/@comment-25093611-20150530213847

Thekillman wrote: I don't think we have any timeline on when he changed hosts, or when he learned sage mode. The most logical option was that he found Juugo's clan and as a result, learned Sage Mode. Considering the Curse mark and how it uses Juugo's clan, i would suggest that he switched bodies after learning Sage Mode in his original, then created the cursed seals to make up for his lost power. I think this is the path of least possible plotholes. It's possible that he underestimated the effects of switching bodies and didn't think he would lose sage mode. but kabuto said that he also found the ryujin cage like orochimaru and learned/masteed the age mode, but unlike him he was able to use it as he pleased, as far as i remember oro met jugo and developed the cursed seals with jugos-KKG and his senjutsu-chakra ^_^