Re: Problem student!!
Well, "you" aren't. Your sensei is. If your sensei doesn't have an effective solution, then the problem really lies with the sensei.
My personal approach would be to pair this person with someone bigger, stronger, more flexible, and more skilled. Let him try his crap, don't let it work, and then throw him hard in return. The usual response is to get frustrated, then angry, then eventually either walk out, or ask for help. When he asks for help, that is when you can start teaching...