He never tried baseball again just because he didn't like it in the first place, he signed for it just for the pressure from the others. They called him coward when he quitted, but imho, he choose to being himself, someone who isn't interested in sport, wheter the others like it or not. And the day right after that depressing episode, he's already back on track and joyful in doing what he likes. You said that Calvin never learns from his failures, I say that he never let those failures discouraging him. That is his strenght. Sure, he still needs to understand how to use it properly, but he has it.