You have enemies? Good, that means you stood up for something.
Originally Posted by Empire
And wasn't kabuto like "oh and it can't be stopped" its the "perfect jutsu" and such? Then he goes and stops it. The lulz of that writing.
No, he actually didn't say that.
He told Tobi that, BUT, he then said to himself "It's a good thing I still have THAT as a backup plan." (He was talking about his snake Sage mode, because he knew he would need that as a backup, because the Edo Tensai could be stopped).
I also thought you meant HOW they revived people, which Kabuto and Orochimaru both explained. :S What else do you want explained?