Madara's Perfect Susanoo is sluggish other than the swing of its sword. Asura Path rockets constantly keeping Nagato on the move should make it hard enough for Madara to get a good shot in with his sword. And its still not a definite kill unless he straight up hits Nagato, as shown by the Kages. A Shinra Tensei to the side of the sword when its in mid-swing should offset Madara's Susanoo and cause it to lose balance.
And here you can't understand simply things. The Sharingan has a great insight which was even able to follow A's movements, what absolutely isn't comparable with Asura-Path. Next point, the perfect Susanoo doesn't even need to aim at Nagato since a mere swing cause an impact to the whole surrounding - The Susanoos first slash wasn't in any way purposed to kill the Kages but only to demonstrate its power. And last but not least Susanoo possesses two swords with which it can go on berserk.
Already the four tailed Naruto turned the force of Devas Shinra Tensei back, so you may consider the strength Nagato will need in order to repel the force which is used by only one swing of a sword Susanoo is using with one hand.
If Susanoo will took his sword in both hands in order to attack Nagato, do you think he would survive while the 5 Kages would not? I don't think so.
And @Shodaime, I won't repeat myself. I don't see why Madara wouldn't hit Nagato easily due to the great insight of his Sharingan, whereby even Sasuke could follow A's movements to a certain point. Besides Madara isn't using his perfect Susanoo only, he has an arsenal which is consisting out of Genjutsus, Katon-Jutsus and Amaterasu, too. You may will tell me that Nagato will counter all of them but this is also just in theory.
There won't be a problem for Madara to hit Nagato by Amaterasu for example
while he is flying up towards him. Sure you will tell me that Nagato will repel it with Shinra Tensei, but this flame will cause damage and Pain anyway and force Nagato to handle it with his Shinra Tensei, leaving an great opening for Madara.
And your last statement just shows your level my dear.
You are simply not able to imagine a realistic fight but reduce it to a Ninjutsu spam, as always. By acknowledging the strategical part, you could realize that Itachi would even be able to outsmart someone like Nagato with explosive Kagebunshins, what doesn't mean that he would beat Nagato in the end.
More I don't have to say actually since I know how this Debate would end.