It isn't that there are no sorcerers. I think it may have more to do with the premise of the fight, and a lack of explanation to why that is the premise.

I am no stranger to detail, and I could easily sum up Corban's magical know-how, history and expertise, but what prevents me from joining is the -seemingly- mandatory history lesson. I'm not sure how doing this would impact the fight in any way outside of semantics, and it only seems to be restrictive to the participants.