“Plothole” is the most misused word in the history of fiction debating holy shit

Lost its meaning the moment it was created.

The word literally got a hole created into its plot by the society that gave its meaning

How is any other kage supposed to be stronger than Naruto?

You just gotta believe it

He is only the 6th strongest hokage.

If his lore is to be believed he is some amount stronger than Hashirama, which would make him the second or third strongest Hokage, since the statements stop applying after Tsunade takes office.