Yeah, I thought it odd that they started having four guests in their line-up and thinking to myself "How are they going to have time for all that?".
So far, Steve Zampanides has been a "hot sauce taster", a "font expert", a "billionaire matchmaker", and an "animal imitator". I might have missed some.
Googling the name, you find a website (
http://stevezampanides.com/) that just leads to his Twitter account that has nothing of substance on it (and not just because it's a Twitter account). So, I'd guess he's Keyser Soze.