Actually it would be the craziest plot twist ever. Or more like one of its mission failed as a child soldier and it was coincidental, some Japanese agents found him and brought him back to his parents
Or even takato and kou are acting with him cause you known hiding your identity needs you to completely fusion with your environment
I'm writing two stories at the same time. Here are the links
https://m.fanfiction.net/s/12686762/1/A-Gentle-Heart-Happiness
https://m.fanfiction.net/s/12686739/1/Hidden-For-The-Greatest
Just now I thought of something funny. The same way we are not clear abt Asami background until now the same way we can't be sure that Akihito background is simple as well. I didn't get to see raws yet but was it really specified that it was Sakazaki and chernobog that kidnapped him. Maybe at one point of his life he was an assassin and after he forgot all