Working it out mathematically, Zodiark still has more raw aetherical power at 8/14 then Hydaelyn does at 14/14, assuming the Sundering was linear. Not to mention the fact that Hydaelyn herself chooses to remain aetherically deprived.
How...? I mean if he controls her Zenos could just absorb all the aether he wanted.

Fandaniel himself says that Zodiark is Zenos's "prey"
Doesn't that imply killing Zodiark? If anything that aligns Zodiark with WoL.

and I honestly dont see how the power to Sunder is thematically appropriate to Zenos when what he wants is the biggest Monster battle ever.
You don't see how the power to split things is appropriate to Mr. Katana?