I'm pretty sure Zenos is one of those characters/products conceived by the marketing department to serve as a counterpart to Y'shtola in crossover games/media like Dissidia,etc. Unfortunately rather than making him an ultra edgy anime antagonist like Sephirot they made him more like that creepy guy at work that stands way too close to you in the elevator and says stuff like "Your hair smells nice" in creep like fashion. Probably sifts through your trash when no one is looking.