Board Thread:Boruto: Naruto the Movie/@comment-6232909-20150811172020/@comment-5273810-20150812192229

My guess is Orochimaru had a son so he could eventually become his new body. Why have him trained in the Leaf Village? There are people way more powerful than him in the village and people who also know jutsu he doesn't. He can use Mitsuki for this and then when he is done with the need to wait for a new body takes Mitsuki for himself.