Madara has Amaterasu now? Interesting information you have there. No matter, Nagato is able to sense it's use and can efficiently counter it. Madara's ninjutsu is simply a non factor in this fight, as i've already stated numerous times, Nagato fodderizes. I also don't know what fanfiction you are writing, but to suggest that Madara would actually physically hit Nagato with Susanoo's blade is simply laughable. You speak as if Nagato, who mastered Yin Release (among the other nature transformations) at the age of 10, would struggle against Madara's genjutsu's, which are not known to be on the level of Itachi's. This isn't even taking into consideration that Nagato possesses the superior dojutsu.
But let's talk about Chibaku Tensei. It's larger than those meteors by a horrendous amount, and obviously one made by Nagato would be even bigger. It would comfortably be able to house all three objects inside it.
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Madara's Perfect Susanoo is taller than the meteor (which is actually stacked ontop of another), but remains smaller than the surrounding mountains. In comparison, we could fit several mountain ranges inside the canyon that was created by Chibaku Tensei. To be honest, it is debatable whether or not Perfect Susano'o, with its current feat, could destroy the black mass. After all, cutting a mountain is not the same as obliterating it.
Without knowledge, if Madara chooses to focus on the black orb, Nagato will have the perfect opportunity to strike and devour Susanoo (leaving it a destabilized mess). This leaves Madara either;
- Susceptible to a Banshou Tenin/Human Path combo
- Death by Chibaku Tensei if he failed in dealing with the core.
Hell, i've not even spoke about Gedo Mazo.
There's little you can say to convince the rest that Madara is the more likely victor, as it's rather clear that Nagato and his Rinnegan is superior to the Uchiha.
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This debate may be a stretch too far for you two.