One thing you can try is to show him that you are the domanant bird in the pen. Your boy thinks he is the top bird and that is usually because he has been a lap bird, being 'on top' of humans he also has no fear of you. Making him fearful of you is not going to help but if you can make him...
That is a good sign. Our boys will set on the patio furniture and stare into the house, sometimes they are waiting for us to come out or they are just watching the television. Sometimes they get to come in the house.
Be sure to imprint a hen and not a cock or he could get possessive during the breeding season. Getting flogged by your favorite guy is not fun. There is a big difference between tame and imprinted, I have many tame peas in both sexes most of my imprinted birds are hens.