No Offense, PopTime, I don't think 15 is too late at all. Many of us feel that a kid should have the tools and training before they get to high school. Many who have competed at higher levels will tell you that there is much to learn yet. Some of these young players have not had the chance to get advanced training yet. This young cathcer should follow your advice and get busy training his blocking and receiving skills.
Young man, if you can throw like you say, and you get to some tournaments and travel ball during the summer, you will be recognized by someone. Good luck and work hard.