Board Thread:Theories and Speculation/@comment-4688597-20150531233756/@comment-734582-20150604220716

Kuroiraikou wrote: If the Senju clan inheritance was Jūgo's Clan's Kekkei Genkai that would have been perfect xD. It's a shame Jugo's clan didn't get much of a backstory. It's one of a number of jutsu that makes sense.

Maybe Senju are naturally fit to be Sages and so, get their power from Sage Mode?