Board Thread:Theories and Speculation/@comment-32617252-20180317055942/@comment-34678409-20180319052655

I actually liked what Lorenzo stated. Normally, if an Uchiha transplants another Ms into their eye, they get that person's abilities not their own like Madara and Obito's case. But if there's a special connection like being blood related, a unique evolution occurs. That's probably why you don't see an EMS retain the other person's abilities.