A person who can debate well with/in front of a large crowd in order to reach a solution. This is sometimes confused with a Master Baiter (a person who is good at attracting crowds with a topic/object of interest)
Teacher--"Ok class, who wants to mass-debate today?"
Jade--"I do, I do! and so does Jenny and Tabitha"
Teacher--"OK, we'll do guys versus girls, whoever comes first gets extra points!"