Board Thread:Naruto Discussions/@comment-3568954-20140803003603/@comment-3568954-20140803060235

JOA20 wrote: Only Uchiha clan members can achieve EMS, since it needs two different Mangekyo to overlap with each other. Senju cells may help slowing down the process, but only a true Sharingan wielder can bring out the full potential of the dojutsu, especially if it's two eyes of the same pair.

you have no idea if thats true. thats the only way known but being that the uchiha do not have the body of the sage thats the only reason there eyes degrade over time so logic dictates that since the senju have the body of the sage then a sharingan in there body would logically be an eternal eye instantly