Yes, there would be no harm in doing this but... when I think about it, J's "problems" with some other kids don't really come down to things that can be defined and taught. It's almost as though it is his very personality that is the issue! Other kids, mostly, seem very slow and quiet in comparison with him... they watch and wait a bit before trying to join in with others, are peaceful (relatively) in their movements and talking, do not give the impression that they are centre stage. But this is J, he HAS to be centre stage much of the time, wants other kids to look at and admire him, and particularly with other boys, has to be "top dog". Of course this does not endear him to other children much of the time! I could read him books about it and talk about it but I just know, really, it comes to something he cannot change. He has had this personality since babyhood! It's not totally hopeless, he does have moments when he is calmer and quieter, particularly with girls, and can sometimes show interest in others rather than just trying to dazzle them - a few signs of hope! - but I'm not going to be able to teach him out of his base temperament. I don't think he's a bully type because he doesn't like hurting those smaller than him or animals but he IS like a bulldozer much of the time... comes crashing in and carries on regardless!
I sense... his peers are going to be the best teachers for him in getting him to try to modify his behaviour somewhat and give others space to be who THEY are.