I've watched the VA Tech ratings since the beginning, and initially, there were far more non-MIPS helmets at or near the top of the rankings. I suspect that what's really going on is that the quality manufacturers are now defaulting to producing MIPS helmets only because of consumer demand.

The fight between Snell and VA Tech has been going on for years, and I'm sure someone could pick apart the Snell testing just as easy. All testing involves simplifying assumptions. I doubt the video guy is particularly qualified to know which method of testing is more realistic.

BTW, I suspect the loose head thing might, if anything, decrease the rotational effects as the head is bouncing freely, and less likely to get twisted around as the body weight behind/on top of it shifts while the helmet is on contact with the ground.