hashi stands absolutely no chance. once tobi touches him he wins. i seriously doubt hashi has the same physical attributes and strength needed to counter 6 edo jinchuriki + kamui when kcm naruto was unable to and needed kakashis reinforcements.
Hashi=madara.both are>obito.
whats hashirama done to demonstrate hes equal to madara?
EMS Madara who got defeated my Hashirama.
really? did you see that fight?
hashirama wins. the flower world wears down obitos kamui easily
you think obito needs to breath? he can just stay in his own dimension then hold his breath when he sucks up hashirama. or teleport away whenever the 5 minutes is up. unless hashiramas staminas endless he cant keep making flower worlds every time obito moves away from the pollen cloud which he should see with his MS + rinnegan doujutsu skill