I have a related question: The other day in the DA I noticed the 109G14 had a ENY of 30 while the 109F was 2o IIRC. In my opinion, and most others as well I'd think, the G14 is a much more capable plane then the F model. So why the higher ENY for the G14. I found that strange. I know ENY makes no difference in the DA but I'm assuming the ENY mirrors LW when all numbers are equal. 
As you say, ENY has no function whatsoever in DA, so the actual numbers are totally irrelevant there. Could be 995 vs 1, it wouldn't matter. So I would not try to find a "higher purpose" in that numbers.
