This guy does not sound like a formal recommender to me; I think the schools are serious about wanting someone who really knows you and can comment in depth on your character, your skills, and your work experience. However, if you've got a network, milk it! There are other ways to take advantage of this connection.
1. Mention him in the "why this school" essay. Don't name drop, but do say something substantive about how what you learned from your discussions with him really turned you on to the school. I did something along these lines. It shows you did your homework and that you do fit with the school.
and/or
2. Ask him to put in a good word informally. If he shoots an email at the adcom, his opinion will end up in your file. From conversations I've had with people up at Cornell, it does make a difference when staff/faculty take the time to put in a good word.
good luck!