I agree, but he would have none of that if he didn't use the most feared shinobi's name in NV at the time.
Cake = Madara's name since he got the Akatsuki with the power of the name.
The Icing = Bijuu
or
Say Madara name was the foundation of the house.
You know what happened the first time Obito used Madara's name?
He got threatened by yahiko...
There is power in Madara's name, but you need to walk the walk if you're doing all the talking.
"So why did the Kages heeded to all that talk?"
Because he has already walked before preaching...
His feats, His power, and his ideal is what made people to believe he is Madara.
Madara told Obito that he left everyting for him, power, knowledge, and complete faith that he will go through his plan due to his personality.
Obito made it clear that he can't take on the five nation with his power alone, but with the addition seven bijuus I'm his disposal he was feeling pretty confident.
With decoy white zetsu and black zetsu on recon mission, he pretty much had it planned.
Black zetsu made the assurance that he will win.
The Edo tensei still lost to the alliance, yet he was still able to become juubi jinchuuriki.