This. But I also pay attention to pings. So, for example, if someone pinged me to leave, and i said no, i know in a few days someone else will ping and try to move. If you are diligent and still can't figure out who the mover is, what i do is, i go 7 days into the future, but start a new save file. Then i will see who moved. I come back to real time and that mover will almost always ping, so i can say no. I hope that makes sense...
I wish when you started for the day, they would meet you at your door to tell you they plan to move. Or, if that is against what Nintendo's is trying to do, they could at least make it where they will be the absolute first ones to ping you the day they decide to move. No more Chief running up to me to ask if I prefer spaghetti or mac and cheese and taking the ping away from Flora, who plans to announce her moving plans!