why is my black capped conure distant toward me?

I have a 7 month old male black capped conure. I also have a year and some months sun conure. I read that black capped conures tend to be very affectionate and playful, but he only wants to cuddle with my sun or sit in the window. I have had him for 6 months. I got him from Petco (don't start, I saved him and you can say what you will about pet stores) and he doesn't dislike being with me, but he's like, serious bird is serious. He has a clean bill of health. I haven't trained him much since his wings were clipped too short by the breeder and I don't want to frustrate him too much, we have very short sessions mostly with things he knows like step up. I don't need him to like me, as long as he's healthy and happy, I'm just wondering if this is common or even why.