i agree nagato is irreplaceable....Tobi doesn't need an army but powerful shinobi.
Orouchimaru was said to be able to destroy a small nation all by himself.
Itachi made small work of Oro while he was blind battered and dead and his full power was never shown.
Nagato took out the whole leaf by himself.
Dedoria infiltrated the sand and took out the Gaara their Kazekage.
Numbers don't count for nothing when your opponents are more powerful than your whole army. I know Itachi and Nagato were one in a kind but he now has Sasuke to replace Itachi which is a good replacement. I don't think he can replace Nagato but I'm sure there are more shinobi who are Kage or high jounin level. That's all they need because along with that Tobi has 7 biju under his belt.
An army would cost money than apposed to mercenaries. Also Kabuto may join Tobi also I don't see him joining Naruto and he isn't nearly powerful to appose ether forces. Also kabuto may still have control over the sound too.
Lmao now he doesn't have to be replaced. I got what I asked for not an army but powerful shinobi. O yeah kibuto might have the sound ninjas for numbersi agree nagato is irreplaceable....![]()