Board Thread:Theories and Speculation/@comment-29769110-20170212133139/@comment-30168130-20170216221639

yes, but if say, tsuna had a baby with some other non-full uchiha, he would have rinne wouldn't he? then why not the rest? and maybe black zetsu chose the reincarnations cuz the rinne formation might be faster compared to the other "commons" among them, if u know what I mean.