is there a connection between Sokichi Banba and Sokichi Narumi?

[Neojin]

The truth is, Banba and Narumi are part of an interdimensional cabal who work towards raising up heroes from the current generation. Other members of this cabal include Uncle Iroh from Avatar:Last Airbender, Grandma Yukishiro from Pretty Cure and Batman.

You forgot about Reiji Osakabe/R0 from Rescue Force & Rescue Fire:

 

[Dark Kabuto]

Maaaaaaaaaaybe if Skull shot Rainbows, then I'd see the connection.

 

[Savior Den-o]

You forgot about Reiji Osakabe/R0 from Rescue Force & Rescue Fire:

Dude, u forgot that he was Kamen Rider Ichigo/ The first Kamen Rider

And, both of them did lead their succesors to victory
Big One: Gaoranger VS Super Sentai
Skull: Begin's Night /W Forever

 

[DeluxeRobots]

Maaaaaaaaaaybe if Skull shot Rainbows, then I'd see the connection.

Skull Xtreme probably shoots rainbows

 

[Wraithstrike]

Let's see, according to our Blue Flare clearance, other members of the cabal that we can talk with are Ben Grimm, Ultrafather and Godzilla, among others.