I can't confirm from first hand knowledge, but it makes some sense. 2 is when park hopping is allowed. But it also means that the guests who leave HS may be replaced by hoppers that started at other parks that morning
I had a good experience doing this in November. It was a Sunday evening on a non holiday weekend and temps were a bit cooler, so that may have been a factor. I went to see the holiday decorations but had a surprisingly short wait for RotR at the end of the night. Was off the ride in time to catch the nighttime show that closed the park.