Not only did he sign my card, he also sent me another card, which he even inscribed "To John"!
I asked him what his favorite moment in baseball was, and he took the time to answer my question, and even signed that. Overall, he went way above what I asked for. It was a really encouraging start to my project. Every time I've done something like this ( 2 times in total), I've always been impressed with how nice they were.