Here is the absolute undeniable truth, 1. No one fights at full power from the get go, 2. You can't dodge something you can't see, 3. It's possible to find advantages in overwhelming situations, and finally 4. Kishimoto writes the story...
there is no proof, its not implied, and the only reason Hashirama could do it was thanks to his chakra...
we need more stats before we can say he can break edo tensei...