SPOILER question about one of the endings

Just got the Easter egg ending where you just fucking leave the valley. Very fun idea, and i loved the after credits cutscene - but I guess i was just curious if anyone knew or has theories on who the other vampire is? Do you think its brancis? This feels like the obvious choice, but i cant help but feel like the man wouldnt care about coen if he just left and didnt meddle in his affairs anymore. I haven't finished the game yet so maybe im being an idiot, but I guess i think it would be cool if its sort of supposed to be a sneak peak at a possible future game or dlc. Either way, knowing he lives long enough to survive until modern times is really cool and opens up a lot of avenues for exploration and possibility.