I dunno about be added to the Tournament, I was thinking that maybe it would be Leonardo if he return to take a position in the Hero Faction's Team for the Cup. He could make Monsters that could keep busy Fenrir and Albion if he they would face Vali's Team in the Cup.
Honestly I believe that maybe Ishibumi thinked about Zekka and her possible friends just lately. Maybe they aren't even his creations at 100%, perhaps it was the editor would told him it could have been a good idea try to make a new Spin-Off for DXD.
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