Certainly not, your comment was well founded and appreciated.
However, (in my opinion) these factors are always present and relevant to the question of cylinder fill. The reversion question has too many variables to be reduced to anything more specific than a trend, not amenable to math.
I had a much narrower scope: only the changes between "official" timing figures, and when the actual intake valve closure occurs. I had to actually do the calculations (I wrote an .xls to do this) before I knew there was any substantial change.