i like some parts of your theory. the idea that tobi isnt exactly madara, but has his character due to some experiment is quite new and fits to what we have seen from him till now. it would also explain why the first thought that he was dead and why he didnt use the ems so far.
about edo tensei idk, it could be possible, but doesnt seem very plausible. even while the edo-tensei-guys can in some way resist the will of the user if he doesnt concentrate on them, i doubt that edo would completely wore off. it doesnt even have to, since madara seems to be more or less immortal. however, what we have seen so far doesnt look like an edo-tensei body, and madara seemed to not know the jutsu.