Jan calls him "King" because it's a higher and more recent title. The usage would be the same if Colin Powell were to become president. Very few would refer to him after that as "General Powell." Of course, there are times when "General Powell" would be appropriate. No, he wasn't ever Jan's king, but he was king over the English. And that was enough. 
Ha! I nailed it.
(One might quibble that it feels like trying to have it both ways: friction with the English to the point that Jan can't call New York by that name, yet refers to their common sovereign by his English title of King rather than the title he held in Jan's native land. On the other hand, it
would just be a quibble. Plus, since when are people all that logical?)
As for the ending. Know that the original manuscript ran for one more page than what you have here. I've posted below. It does make the resolution more clear. However, the editor for the first publication thought it was redundant. I think it's a matter of taste. I go back and forth between the two myself.
I completely disagree with that editor. There's a big difference between 'redundant' and 'explicit'. If nothing else, it brings back the green dress, the non-reappearance
of which always bothered me. I felt it had to have
some purpose and here I find it does (or did).
I also really like that last reference to the corn stick, which again brings the reader's mind back to the beginning (and hints at the almost-confrontation with O'Day).
Of course, it may well have been those things that he felt were redundant.
As you say, a matter of taste. I can see the editor's point, to a degree, but if I'd been in that editor's place (assuming I felt that way about the ending, which I don't), I wouldn't have had you just cut the ending; I'd have encouraged you to rework it a bit, possibly tweaking other parts of the story, as the excised part really does hearken back to the opening (and possibly, if one were to look deeper, to other points in the tale). Its absence leaves those connections hanging, like strands of a ripped spider web, though I only dimly sensed that before now.
