@oldtrainerguy28 what is the issue with using a football headform? You keep bringing that up, but I cannot see why that would be an issue unless I am misunderstanding what a headform is. It is a model head, correct? Are you saying that there is a significant difference in the average football players head and the average hockey players head? Also, where are you getting your information on the headforms, necks, etc.?
I do agree with a lot of what you say - fit is the most important thing, and helmets can't really prevent the brain slowing down and hitting the skull... Except... when looking through the other ratings for bicycle helmets, it seems that the MIPS helmets all perform better than non-MIPS helmets. This makes a lot of sense to me, as MIPS, if working correctly, will essentially give the head another few millimeters to slow down - a crumple zone if you will. Obviously the helmets have to be larger for this, but they don't have to be heavier which would be the real issue (whiplash). I don't think MIPS will have much real-world effect, but I don't think it can hurt. Are there any other systems, named or not, that have a similar effect?
Ultimately I do not believe the VT study is bunk, as you're saying, but I want to see the data you're looking at and understand your position. I definitely don't think it is the end-all-be-all either, but I would view it as a valuable guide, knowing that the most important thing for any helmet is that it is properly fitted. Especially as it actually has rankings, compared to HECC/CSA pass/fail method.