UH! WHAT?! An Edo Nagato just needs to activate the Preta path and when Minato gets near him his Kyuubi chakra is absorbed. Then what? He's nothing. . . Well, he's a top tier ninja. But compared to the best shown rinnegan wielder? Nothing.
Nagato mastered all five basic elements and is, as I stated earlier, the most proficient shinobi with the rinnegan. Large scale jutsu like Chibaku tensei will be useless, but with shared vision thanks to his many, many summons. . Minato is not sneaking up on him. His ninjutsu is canceled out.
The only reason (Or the largest) that current Naruto beats him is because he can force Nagato to NOT use Preta path by amassing Sage Mode clones. Minato does not have this option.
And food for thought. Minato sealed Kurama's chakra, but can THAT chakra naturally replenish itself? Or is it a one time thing, you use it and you lose it. Well, the amount you use is the amount you lose.
Very curious, as Kurama is sealed within Naruto and Kurama has to meditate to regain his chakra. I don't see Minato regenerating that chakra. And without it, he just lost what apparently makes him so powerful.