Well that's my role. I won't even bother defending it, I only copy-pasted.

My defense? History. Not helped by the fact that none of us four ever did betray Cao Cao. However, Cao Ren and Xu Chu seem to be the least likely. I can't help but suspect Jooray for being a former advisor to Yuan Shao, as was Paulus. However, I have no way of knowing whether or not he was online.