Board Thread:Naruto Gaiden/@comment-4704473-20150603131227/@comment-7878046-20150604024841

I think that Shin Uchiha (the father) probably got some of his own DNA and cloned himself around the same time Sarada's generation was born. The clones probably grew naturally over time to who we know as Shin Uchiha (the kid and the others). The question is: why clone himself?