User blog comment:B214/Question and Answers 2/@comment-187.209.0.247-20140225185340/@comment-187.209.0.247-20140225193602

But CaoCao is still the same, and he desire to kill issei, even if for the moment he is part of DxD team, in the future he will betray DxD team to kill issei and make his ambition reality, Kill all the demons, Dragons yukai, fallen angels, all unnatural existence that is dangerous for humanity. I speculate that CaoCao will betray DxD team. and the True Longinus will reject him again.

VOL 9 CaoCao words:

Cao Cao tapped his shoulder with the spear.

"Sorry Sekiryuutei. Looks like this is the end. Strong, you are all very strong. This is already exceptional amongst devils. But this level of power cannot win against us who hold the power of heroes in our hands. Also, for devils, fallen angels, dragons and youkai to be uniting as enemies of humans, isn't that too scary? Wouldn't humans feel threatened? Resisting is only natural. --It is only normal for humans to defeat Maou and dragons. This is the principle behind our actions, we of the Heroes Faction. Well, whether for me or the other members here, that is one of our goals. --Anyway, Georg, how's the magic circle?"