i would say pain..f.example his jutsu gedo mazo he used against hanzo&co with the ability to drain souls maybe suffices alone...he can also control beasts with his doujutsu...like the sharingan user madara through a strong genjutsu..another problem is the rinnengan itself that could use every existing jutsu and also jutsu nobody knows with gravity-ability like the "black hole" jutsu chibaku tensei...it would cost an explaining roman to show of the possibilities in which way pain could beat this jinchurriki...anyway pain itself is not perfect ...in the end...he wasn`t the god he want to be...in the end he was truly a human being with human feelings like beleaving in something...to beleave in the good in this world....enough of this humble contribution p.s sry for my englisch out of practise