I'm thinking the Rod is to control either the Jyuubi, or Obito. If Edo-Madara had such control over Harashirma, then he would've spent time punishing him instead of fighting each other to a draw. He may be able to tap into Senjutsu, or use it, but I don't understand how logically he could control Kabuto's Edo's that he can't even control #1, and how Madara even survived the Edo shutdown in the first place... Its not like he created the jutsu, or even controlled Kabuto's mind in the first place to get the knowledge to 'hang on'. Unless the Rinnengan just overrode the control, but that doesn't explain why Nagato didn't have the same opportunity. Plot holes everywhere in this bitch.
Show Me How Much You Have Evolved...(As Tian walks toward an Army he's been waiting eons for).
I speak 4 languages...
English, Profanity, Sarcasm, and Real Shit.