Perhaps the Sage's brother was the true Second of the Six Paths and could be a potential villain for a part iii?
That would be cool. I have a theory that the Hagoromo clan from the pre village wars were a clan that are either direct descendents the Sage via his brother, a clan born from the inter-mingling of various Senju, Uzumaki, Uchiha and Hyuga (these would be rouge clanspeople who'd abandon the blood feuds of the Senju and Uchiha in favor of integrating with the descendents of the Sage's brother, that is) throughout the years thus giving themselves enough genetic diversity to gain a mere fraction of the power the Sage possessed (I also believe that the Gold and Silver Brothers came from the Hagoromo Clan and inherited enough sage-ish power to eat pieces of Kurama's stomach flesh), or a combination of both scenarios.