Very true, although TEB and MMU are fairly quiet at that time of night. In fact, MMU tower wouldn't even have been open.
I was focused on EWR for that video, but, as you eluded to, JFK seems to run the show. Based on a comment left on my site, JFK swapped at 9:40pm, followed by LGA at 10:20 PM. EWR followed right around 11pm. I wonder if it's any coincidence that each was 40 mins apart.