Super sorry for asking so many questions! Playing this game again makes me feel stupid, because I cannot wrap my head around the villager move in mechanics no matter how many times I read guides and explanations, apparently. lol
I tt'd to get Diva out of my village, then went back to the correct time and waited for today. I decided to make sure nobody was moving into a weird spot, so I set up a new file, walked all over my village and found no plots. I did this four times, and there was nothing. So I loaded up my mayor, walked around one more time to check again, and still found nothing.
Now, 15 minutes of regular play later, Henry suddenly has a plot set up. I should have seen this, because it's a couple of tiles over from the bridge I normally use (and did use earlier).
Edit: Ok, I tried closing the game without saving, just out of curiosity, and when I started it up again, he was not there. But as soon as I went went into my house and came back out, his plot showed up.
Did I miss something? I thought that they only moved in at the start of a new day? Oooor did my tt'ing to ditch Diva mess things up somehow?
(That said, Henry isn't in an AWFUL spot, so I'm not too bothered. I don't particularly want or need another smug villager, but it is what it is. I'm just very confused and feeling kind of dumb, haha.)