I don’t know if it’s correct but the way I see it it’s like he is growing as a person by them merging (disappearing) with him.
For example I used to be very outgoing as a child but now I’m more timid and I know that is just part of my past. Just like being an edgy teenager and being curious and craving sexual experiences.
When I look back I’m kind of glad I could move past them and incorporate them into myself. Like too much lust would turn me into a pervert but without it I’d be some kind of naive damsel.
Too much of the snappy and edgy teenager stage would make me a victim playing asshole with no set motivation but too little would make me not capable of forming my own opinions and standing by them (opposing parents and such), comparing myself and realizing that I’m lacking in areas that another exceeds in gives me reason to improve myself (setting goals and dreams), through other opinions and differences I learned how to deal with sadness.
So it’s quite important that they passed and existed and he wouldn’t be the same person without them.
Anyway I’m sorry/thank you for listening to my ted talk.
I feel like this is making such a mess in my mind. Like I understand they are the same person but I can't help but feel sad about any of them being "gone" it feels as if im truly losing them and it makes me sad wtff I don't make sense like i don't want Rei to dissapear but he is the same kazuha... oh boi╥﹏╥