Pecking order and male/female relations are only tangentially related in young flocks. (unless the pullets are a lot larger or more aggressive than he is. Which happens, but is really uncommon.)
Right now, he's only ten weeks old. In about five weeks (average) he'll start wanting to mount the hens. Young cockerels often have terrible technique (resulting in injuries) and mature faster than the pullets do (which means that there's a lot of chasing and feather-pulling.) And he won't calm down for at least the next six months. There is a reason I have a rooster specifically to run with my juvenile flock. He doesn't go for the pullets, and he doesn't let the young males do it either.
A cockerel raised in a multi-generational flock gets beaten up (by larger hens, by the rooster) until he learns to control himself and leave the harem alone. When he's old enough and large enough to challenge The Rooster, he's usually mature enough to not be a complete jerk. He should have watched the previous rooster and learned from him how he's supposed to behave. (calling the hens for food. Escorting them to and from the nesting boxes. Alerting for danger. Doing the wing-dance to court them instead of chasing them down, seizing them by the back of the neck, and using his larger bulk to force them down.)
That training can't happen in a single generation flock. It's possible that you got a cockerel who's an absolute gentleman without any training. It does happen, especially in the game breeds. But it's unlikely.
EDT: The best way I've seen it expressed is this: "You don't have hens and a rooster. You have pullets and a cockerel. The behaviours are completely different."
i plan to keep my favorite ones and was wondering if 1 rooster for 12 hens would be a good ratio to where the hens aren’t getting messed with too much, They’re about 2 and a half months right now.
. Not that it makes a difference but I'm 
