I’m also getting the impression the Professor knows far more about ‘The Croaking’ than he is letting on, and getting the impression that Ky may have met Crows when he used to live by the coast, it would make sense given that when Ky first met Scra, he showed no animosity towards him
As for the sea caves, I did think that it must be Osprey territory, and it has been mentioned that Ospreys as well as Crows are seen as inferior by other flocks... There are links that are definitely being pieced together