OMG noooo! I'm like 99% sure that's what happened with Zell, that someone brought him when they visited in a way. Because when he moved in he said he had moved from a town actually and I was like ??? lol excuse me what
Wait is it because he was your tenth villager that you'll have to move someone else out? Maybe if you let other villagers ping but make them not move he'll ping eventually? Or is he actually not able to move out until 1 other villager does?