Hi there my friend,
I know this sounds weird or crazy but DCs are actually you yourself my friend or in other words, you alter ego. So each DC in a dream is a manifestation of your personality. But among this DCs is a Dream Guide, a dream guide is a DC that has superior knowledge than that of ordinary DCs and even more superior than yourself. Anyways, the DC you've just met is possibly your dream guide. But, more tests or observation on that DC must be done. Try meeting him again in your next dream and test him wether he is your dream guide. If he really is your dream guide, you'll be surprised with his/her vast knowledge regarding not only things related in Lucid Dreaming but also things related to real life. Hope this helps