Board Thread:Theories and Speculation/@comment-25645405-20150717154745/@comment-26675690-20150719152847

I think the whole concept of EMS was made up by Obito or Itachi seeing as Madara never refers to his EMS as EMS but as an MS or Choku Tomoe. So while in essence they are the exact same thing the only difference between them is the name which is most likely due to the different time periods ie. Warring Clans and Shinobi Villages