George Watson - George Watson's Parents are Unknown?

My mother nicely found a path to Robert II, King of Scotland, through this gentlement, George Watson of Penobscot and Plymouth but unfortunately it looks like his origins are unknown. I'll check in the recent publications of the NEGHS, but if anyone else knows about the Watson family, it would be helpful to have others like at this. Especially descendants and managers, since I don't want to simply detach him from his supposed parents without letting you all know.