my idea of this theory is, make the manga's hero naruto compared equal to the sage, so i thought what all can be a power up for naruto.
1. i just made it a point that naruto can be a perfect candidate for rinnegan.
2. and also i wanted to project him a better sage on par with rikudo. since he is already considered to be a point higher than jiraiya on sage training.
3. and also a similar person as jinchuriki like the sage himself
1. moon eye plan
Madara's plan is to gather all the tailed beasts in order to fuse them back into their original form, the Ten-Tailed Beast. He will then become jinchūriki to the Ten-Tails giving him immense power and the ability to project his Mangekyo Sharingan on to the moon. He intends to use the moon, the prison of the Ten-Tail's body, to cover the world in an "Infinite Tsukuyomi".
2. get the rinnegan
he plans to get the rinnegan
->a power up
to conquer the world (lol) which may also includes the controlling of tailed beasts.
thats it DUDE