Having another brother with both hair colors at least is puts to rest some of the rumors that Tobirama and Hashi aren't really brothers. Just a thought.
too bad he didnt have hashiramas cells cause if he did thenthat stab in the chest would be the perfect thing to get him all pumped up to kill the uchihas
But what this chapter is saying is that the world of Naruro used to be like that of real ninjas until Hashirama and Madara came and changed everyone into orange jumpsuit wearing ninjas.