So about the former kages...

[paratise]

They came in this chap:

Spoiler

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Appearantly they were needed for helping Sage:

Spoiler

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Why them though? Isn't being a kage a politics and military associated title? What does them have to do with sage and what made especially kages needed? Kages are not necessarily strongest ever lived, most intelligent, have most chakra, have more link to Sage's family etc.

So why they were needed as kages, have any idea or did i miss something?

 

[senjusana]

Maybe Kages are needed by SO6P for his Army.
:O

 

[Tobi98]

He couldn't just create new characters out of the blue

 

[Kirokill]

Probably because they're the most famous for having strong chakra. Maybe because the edo hokages knew them having the most chakra. So Hagoromo looked for them there and summoned them, instead of using a search web looking for "Who had the most chakra".

 

[Akame]

To become a kage you have to do something big right!? I'm guessing he needed people with a lot of chakra.

 

[paratise]

He couldn't just create new characters out of the blue

Why would other characters needed for what sage did anyway?

 

[ᖇ α z m α η]

Cuz they have a better link to the current shinobi system .​