Honeslty i don't think jk is the most manly.I think in general at the begining guys that are interested in this industry in South Korea are mostly flower boys. Because of the no dating clause. Or maybe like your said the companies are especially chosing flower boys for their groups. But Kook was chosen when he was a kid. He definitely showed clear signs that he liked girls in hustle life. He always sports more manly clothing then the others in their private life. He literally grew with them and jamal and VvV constantly hugging trying to kiss and doing fan service stuff with him infront of cameras. Jamal from the begining showed that he finds him handsome and tried to kiss hug etc him. And lately VvV is hugging and showing that he likes him. Maybe its all a show or a competition between vVv and jamal. But it looks like how preys are groomed by predators. I watched "leaving neverland" the other day. I wish I didn't watch it.
All that mk ultra stuff still feels like something from a sci movie.
He is the one who put makeup in daily days ( he is the best as doing his own makeup, member said it), and wear earrings a lot. He even put female parfum on.
I think the most manly is jhope. He said he don't have his ear pierced because that for woman on fansign. Also namjoon seem kind of manly also. The most feminine are Jimin & v but jk is also kind of feminine to me. (his personality and how he behave smth)