Board Thread:Theories and Speculation/@comment-32617252-20180317055942/@comment-32617252-20180317232233

well, they say that either u steal an ms and get its ability, or u steal a close relative's ms and get the ems. its either or. madara was not related to obito, thus him stealing kakashi's ms only lead to him having its basic abilities (but they were amped as fuck lol madara was going in and out of kamui, and had no repercussions whatsoever), while him getting izuna's ms lead to his current ems. same for sasuke with itachi's ms. like, its pretty simple, u get more powerful by using someone else's power or u just amp ur own.