Board Thread:Theories and Speculation/@comment-26367861-20160713002352

so this has been bothering me for a while. Obito's MS doesn't have any negative side effects. i believe the reason to be he has senju DNA inside him. he awakened his MS after his new body was grafted onto him. so his MS is a manifestation of both senju and uchiha chakra. Here's where my theory goes into play. What if an uchiha was born half senju or half uzumaki? well i think the deteriorating eyesight is because a pureblood uchiha cannot handle the power of the MS because they don't have the body of the sage along with its regenerative properties, as a result they normally result to implanting mangekyou of a close relative, reason why its a close relative is because the chakra needs to be compatable as well as dna however they are just ciphening off another's power the only reason they can use their original abilities with another's eyes is because part of the chakra overwrites the others abilities and can also explain why ems looks like a combination of both patterns.

in turn i believe obitos MS could be a version of EMS except augmenting the body instead of the eyes. 