Whoa, an interesting observation. But to me it seems to be more of a mythic hint, than a direct thing. To attack a ship in a material form seems too crude and out of character for the Outsider, unless the ship iself is important somehow, which is doubtful.
The Outsider has something against Delilah for sure. To send an upset Daud to find somebody is hardly a gift to that person.
I'm curious about the source of Delilah's powers. She spoke dismissively about the Outsider in the last scene, but she is a witch, and is he not the only source of magic in their world? Also her magic seems to be connected with plants somehow, and that does not look like the Outsider thing. It is said that Daud worked with the Brigmore witches before, but I don't know whether that should mean, that Delilah is working with the Outsider too, as Daud doesn't seem to be too attached to the man (thing?) and probably could look into some other magic sources or types, if there're such. And it is strange, that Delilah knows that Daud fell out of the Outsiders favour - from where did she get the info?
Maybe, the Outsider decided to wipe his list of chosen ones clean by putting them one against another. But who knows thoughts of shady whale deity? 
Hmm... So much mystery and suspence! It's a good premise for a story, I hope Arcane will give us an impressive ending.
(I messed up the grammar, sorry)