Despite all the favors Marico and the Windsor family received from Zach, Marico was still doubtful about whether or not to marry his daughter off to him.
The reason for this was again Zach's terrifying potential. His strength turned out to be far more than he had initially displayed. It was enough to break down the sanity of any living human in existence. And Marico wasn't an exception to this as well.
A monster capable of raining down meteors from the sky wasn't someone who could still be considered to be among the realm of the living. He was either a devil from hell or a god from the heavens out to play in the human world.
Marico had first met Zach when the latter was still in the process of finding a home for himself and his family. He had been on the run from the royal family, but he had potential. Therefore, Marico earned his favor by giving him a place to live and helping him acquire Greenland.
