No, they may be too young at 5 weeks for it to be the beginning of a dominance behavior....One of my two rooster chicks is very socially adept. While both of them will jump onto my shoulder/head, Moses will jump onto anyone regardless of if they're strangers or not. I was just wondering if maybe there's an instinctive chicken reason why he does this, or if maybe it's friendliness?
.....it's probably just that they like to be up high and they are not afraid of people.
BUT...It's not a habit I would allow to continue, especially the cockerels...it's cute when they are tiny, but can be devastatingly injurious when they get larger.