Well, considering that Elidibus immediately ran away at the sight of Zenos...
Same. Zenos is a powerful piece for the Ascians to manipulate, and I imagine stroking his ego to believe that he can absorb Zodiark will cause him to work with them to release Zodiark.
And then it turns out Zodiark is too spicy for him and he gets absorbed/killed/whatever. Classic shonen tropes.