Board Thread:Naruto Discussions/@comment-28294008-20160424155402/@comment-3965545-20160427223250

He was going to awaken Rinnegan himself eventually.. Hag giving him half of his chakra sped up the process and gave him the MS using Rinnegan. His warp tech and his spacetime tech just happen to be his Rinnegan's user specific techs, like how Madara has Tengai Shinsei and Limbo.