That's too bad. I hate it when I send out an important email like that and don't get a response. The problem with email is you just don't know what the recipient is doing/thinking. He might not have even gotten the email yet...broken computer, out of town, etc. Or he might need more information about why you are answering the question and would prefer to talk about it in person. I'm sure he will talk to you about it. If he doesn't bring it up, you should. It isn't a dumb question.