I had one job and I fucked up. I meant 1 and 71, not 72.
Originally, Seaworld came to Clan Aorai for training and to be sent to the Plaguebringer to serve her.  At the time, Clan Aorai was renowned for their training and quick turn around.  He wasn’t really ready to be exalted, but he didn’t know what else to do--all his children had been exalted and he himself was turned away at every other clan.  Too old, too bred, to ugly, too much work.  He figured the best thing he could do was to follow his children in service.
However, Belila had watched him sell an item of clothing for far more than it was worth to a passing dragon and offered him a choice (as she does from time to time):  Serve the deity or serve her.  At first Seaworld was skeptical; what would the matriarch herself want to do with him?  But eventually, he quit his training and stayed.  The two don’t interact much past that, tho she does reward him with the plumper insects when he makes a particularly shrewd sale, and she brought Marille into the clan to stave off his loneliness.
He’s not too aware of her shady business or personality as she awarded him with the nest furthest from her, and doesn’t question the others’ loyalty to her.  He assumes that they, like he, were given opportunities beyond their ken and knows nothing of her infections.