I agree with EM. Yoda had to hide out so that he could the new generation. If Palpy got wind of Yoda helping the Rebellion, he would have had Vader out after him in a second. Yoda just couldn't it. As for Leia, I think she probably got confused at a young age with memories of the Organas. The question is, how much did the Organas tell her? Did they tell Leia that her mother died during childbirth, or that she died while she was young? As for Boba, it might have had to do with technology. Maybe the blaster rifle proved to be a more powerful and accurate weapon than two pistols. Also, since Boba was aged naturally, he had more time to develop his own unique personality.