The point about the rinnegan being more powerful is pretty much about the six paths techniques only a rinnegan user can use. If he has EMS he wouldn't have that teleportation jutsu. If you notice the eye that does the jutsu is not transplanted or used for anything but that jutsu and is just a regular sharingan. He had to break his mask off and risk being destroyed by konan as proof of its worth. That eye has some special connection to that jutsu. It is also safe to assume he also wouldn't have senju chakra either and this would be pre-hashirama madara vs young fully healthy nagato. We've seen shinra tensei blow away amaterasu, we've seen his ability to absorb any attack, we've seen all his paths basic abilities except demon. Since he would have the power of the six paths he could counter tsukuyomi with izanagi. It's also not known if his was near itachi's level either so its effectiveness is not known. Anytime I've ever seen visual genjutsu used the user is put at risk because he/she has to stay still, which isn't the case in other genjutsu. There is a reason tsuki no me was implemented after he died, and not while he was living. Also nagato probably has a space time jutsu. In episode 166 or 167 he is about to transport both tendou and naruto but is interrupted by hinata. Nagato could use any jutsu he wanted since age 10, and this is testimony from jiraiya. If its a battle of eyes, jutsu, chakara and power, nagato would win hands down especially against the madara in the description. Now current madara is another story because we don't know if the sages rinnegan had tome in it like the drawing during in his fight with konan shows or not, and if the combination of the two means anything specific. He lost to hashirama and states that the senju clan was the strongest clan. Which means not matter what he says hasirama was stronger then him as he admired him for his strength and is the only person he admired. His excuse for losing is well a losers excuse, and he probably didn't initially figure out the solution until he made a replacement body out of hashirama's cells. that was also rushed as a ditch effort to stave off death and later turned into something more. As for him giving nagato the rinnegan, its unlikely. The manga and anime both show it being activated first when he killed the guys who killed his parents and then fully when he killed that tsuchigakuri no sato chuunin. If he implanted them, when? It couldn't have been during the same time frame and you take take how long sasukes recovery is taking as proof he wouldn't be able to use them if it was. Nagato also says it activated in him and he didn't know why. Its more figuratively saying he gave them to his as he is the reason for the war that allowed them to manifest in him.
