The bijuu should have come spilling out of him after Night Gai or Sasuke cutting him in half.
Why?
The shinobi alliance should have sealed him when Lee cut him in half.
And they would have failed just as the Kage did when Madara broke out with Perfect Susano'o.
If Tobirama had attacked him when he didn't have rinnegan that would be the end of him.
He can manifest his Susano'o without eyes.
Or if Gaara had decided to seal him after the Meteor destroyed him. Or when Gaara immoblised him completely, it would have been so easy to, rather than use some stupid seal on a MORTAL MAN, use a Sand Burial.
Gaara was weakened from that same meteor.
How about the time he got hit with a massive lava shuriken and the guy who could have immediately ended him by extracting the bijuu sat there and did nothing?
Naruto needed the help of the alliance to pull the Bijuu from Obito. Playing tug-of-war with 9 Bijuu at once is much harder than 1, I would imagine. And it wouldn't have been immediate either. He would also run the risk of Madara pulling back, and extracting his Bijuu.
What about that part where Hashirama immobilised him, but let him get on with using a Jutsu that would have made the immobilisation meaningless?
What could Hashirama do against Obito Rinne Tensei'ing Madara?
How about if Hashirama had actually attacked madara rather than stand infront of him when he tried to use Obito to revive him?
Hashirama had to stay to keep the barrier up. That was why he used clones.
Oh, and Hashirama should have made sure madara was dead. Head Removal would have done the trick.
Head removal wouldn't stop delayed Izanagi.
How about the army of unstoppable Ootsutsuki's apparently waiting on the moon to guard the gedo mazo, who inexplicably didn't fly down and murder the hell out of Madara when he summoned the mazo.
This was maany years ago, when Hamura was still alive and took lead of the clan. Who knows if they are even still there.