one thing kurama at full power was far stronger than madara when he was alive and maybe stronger then the 1st for all we knowI would hope so...toad sage mode+rinnegan+biju mode+ the fact you need ems and senju dna (mokuton) to obtain rinnegan...if he would still be weaker than Madara then I don't know what to say about this manga anymore.
what there has only been 3 and half uses of the rinnegan and only 2 of them got it without implants let there be a 4th rinnegan use naruto really i don't care but it would cool to see naruto with the rinnegan or sasuke's eyesI hope no one else gets the rinnegan. We've had enough of it.