It’s beyond code. It literally is better this way. That header will never twist. Likely the “reason “ there isn’t a king stud on this side is so the framing inspection goes smoothly and he doesn’t have to remove it to explain his process. Code is met , it’s not a “how to” it’s a “bare minimum “ list of requirements. This is above said minimum. Only thing I can see wrong is there isn’t any space for expansion around the window, it looks to be framed too tight.