I’m confused, did I miss something? Jin is the brother, but the person they show under control of the blonde girl is the friend right? Our MC is still avoiding them. But he has the double mole under his eye like MC did in the first chapter.
Fairly sure they are saying that there are 2 jins, now. One that randomly appeared at the mountains, and another that was created as a result of a wish/power requested to the gods from one of the heroes.
If you care about continuity of consciousness, it is a bit up in the air whether the continuous consciousness is the one in the mountains, the one given as a power, the one still in japan, or neither of them. My guess would be that there is either one in japan, or that guy spontaneously teleported into mountains - but for the latter odds are that transmigration is a hickup in your consciousness anyway.
If all you care about is the id, ego, superego, ood, personality, memories, identity, or whatever - and not about the continuity - then there are literally 2 jins in this world now (because this was described as a "puppet that can read memories", meaning it is all that matters to be a person - makes sense since otherwise her blessing would not fulfill what she asked for and the gods wouldn't be divine or gods). Identical in all aspects from the onset, and only diverging from what they acquired and experienced from thereon.
So arguably the one that is a slave to the heroine is the most "true" jin, since he presumably lacks all those divine blessings, life-changing experiences, and freedom, that our jin has. In conclusion, this manga follows a fake.