Sorry, I realize now that I should probably be more specific

The playfulness and nipping:
I'm getting the picture that he's acting like a normal adolescent and is trying to entice you to play by jumping, bolting, mouthing, etc. Whenever he does this, he's trying to solicit attention. So, you just have to remove yourself from the situation. If he's in the yard and he's doing this to you, immediately walk back into the house and close him out. Try to enter the yard again. If he does it again, immediately leave. Your timing is very important! Eventually, he will stop jumping/nipping. At this point, get a Sit or Down or whatever from him and give him a treat. Now, he can have your attention. Repeat this any time he acts unruly, and he'll quickly learn self control.

Not listening to you:
I don't think he necessarily doesn't believe you're the leader. I just think you need to spend more time going over the basics with him (and try not to use aversives). Take about 5-10 minutes every day to work on basic obedience. Take him into a quiet room and just spend time training the old stuff. Eventually, try the basic ob. in the living room, the kitchen, the backyard, the front yard, etc. The behaviors will generalize and he will listen to you.

Not coming:
It's basically the same as above. Recalls are especially fun to teach because you always have to keep them quick and fun. Throughout the day, periodically call your dog in a happy voice. As soon as his head turns your way, click/treat or just visibly offer him the treat. Repeat repeat repeat. Eventually, try it in the yard, the front yard, the streets, etc. The more you repeat it, the more bombproof it becomes.

Hope that helps!