2) Madara expected for Nagato to Revive him, Not Tobi. IMO MadaraWanted a Victim to Sync with GM, In order to a) Reconstitute the Juubi, b) Revive Madara.
Madara Himself Would be the Jinchuuriki, That would give him the same God-Like power and Status of the SO6p.
3) Tobi's role is to guide world events toward the Ressurection of Madara, including collecting the Bijuu.
4) IMO Tobi is incompatible with the GM, because he is an artificial being, or at best a Chimera, Part Zets, Part Hashirama, Part Madara.
Tobi definitely wants to do this too, and I think this is the Madara instinct inside him that is responsible.