Quote Originally Posted by Kesey View Post
...once the 8th rejoining takes place he will be strong enough to escape the moon and then he will rejoin all the shards making himself fully powered.
Remember the alternate timeline with a successful 8th Calamity in which this did not happen.

Regardless, Zodiark on the Source is 8/14 so speaking from a pure total aether point, he is indeed the more enticing option than Hydaelyn.