He planned to solo every zombie via releasing edo tensei, and was madara even summoned before nagato got totsuka'd?
Yes he was summoned around that time
Edo madara debut: 559
Nagato was last seen in 552
Actually the reason Kabuto decided to summon madara was because nagato got sealed :You must be registered for see links
Then how did Sasuke know of Madara
I'm not sure which madara sasuke referred to prior to his arrival at the battlefield.
As far as he's concerned tobi could be "madara"
Because he would've won and we need to see Kaguya.
Where is yout sig from??
Why seal Madara when you can go seal all the Edos at the same time?
It's from of the opening fight scene. I can give you the url for it
I'm pretty sure Nagato sensed Madara. Itachi must have known. Why didn't Itachi go seal Madara?