the uchiha clan can learn sage mode since they already have large chakras/strong chakra plus strong bodys. that along with there ability to learn sage mode faster then anyone
you have to feel the pain of losing a lost one as in itachi case.
its assumed that shisui unlocked his MS from his father either dying in the war or another way
the jutsu was incomplete the one orochimaru used and he did not have mastery over it so when he brought them back they were no where near there full power plus they had there minds completley over run
you got a good point.
but alot of people are getting confused between Indra spiral dojutsu and the MS eyes. people think his "MS" is the spiral dojutsu but i believe it was either the first EMS or another type of dojutsu that was combined with the sharingan/byakguan or it was a mutation of the...
its not sure on the either to since its a 50/50 thing... but no matter who says anything the sage did not get the rinnegan naturally. his mother got chakra from the tree/jubbi and the sage of 6 paths was born with chakra. so rather he was born with it/unlocked it does not matter since it...