A good definition of what Cortina is referring to as "neck sizing" would be nice. I think it's subtly revealed in the full context of his presentation, key word "subtle." I take it to mean "no body sizing whatsoever at any time."
That is sure what it seems like in those videos of his. What he seems to be calling FL sizing sounds a lot like bumping the shoulder a few thousandths and resizing the neck. What a lot of people would call partial full length sizing.
In at least one of those videos of his where he is at some sort of a match and goes around asking people if they neck size, one of the participants seems confused by what he is asking and spells it out , that he bumps the shoulder and resizes the neck.
Or at least that is what I took out of his videos.
