Kohga is implied to be a dread Pirate Roberts situation(name/title) so yeah. Perhaps Kass's mentor over Monk Maz since Impa uses a lot of his potential moveset. The artbook also mentions a Lizalfos General leading the monsters pre calamity. Plus there's some stuff they could round out with original characters on both side. I also think people are underestimating the chances we get the BOTW modern champions/Kass as an epilogue that may not be dlc
Good point about the Monk Maz and Impa as well as the Lizalfos general. I do see the current champions as a possibility but I'd personally prefer new characters myself.