Well in my opinion it's just a plot hole(like that's never happend in Naruto before

)
Madara said the only one who can stop him is Hashirama, we can guess that since Madara at the very LEAST was alive right when Nagato was born.
Meaning he's seen Hiruzen in his prime.
The reason Im like 99% its a plot hole is because was Hashirama ever really hyped that much in part 1, or even most of shippuden?
No...he wasn't.
now all the sudden Madara appears and Hashirama's power is that of a fairy tale.
Hashirama, makes a little forest in part 1.
Now all the sudden if him and Madara fought maps would have to be changed because of the scale destruction.
I mean come on! it's obviously a plot hole.
and if you still refuse to believe it's a plot hole think of it like this orochimaru had control over him. Maybe Hashirama was a "machine" Oro just didn't know howw to use
