Board Thread:Theories and Speculation/@comment-27260817-20160131185914/@comment-734582-20160131205508

Mitchmaster25 wrote: Was that stated in a data book? I don't remember it being said in the manga. When Madara seals the Biju, Zetsu mentions that Kurama has to be sealed last, as the Statue otherwise can't handle it's power. This directly suggests Kurama is the strongest.

If you look at the various Biju, it's clear that the Sage balanced them, trading ability for raw power. E.g. Shukaku has the most abilities (Sealing marks, sand body, magnet release) but the least raw power. Kurama and Gyuki have the least abilities (Negative Emotion Sensing and ink, respectively) but the greatest raw power.