I had a big long post posted, but then i reread yours and it didn't make an ounce of sense.I'm in agreement with you with the thread.
Going based on that there have been many who thought they could cut it professionally at the world level. Nico,Peat,Hill are amongst the best ever. With every category regardless of the category, there are people who should be at a category or two below where they are I'm talking about the ones who are consistently getting slower times through out the runs than someone at a lower level. Yes people do have off days, but it's saying something if you are consistently getting out done by people in lower categories. Can't really name names right now, being that I'm just getting back into the DH game seriously again. Still am getting caught up with who's where and who is no longer racing. In drawing the line, I'm talking about the bottom 20%.
Basically, you draw the line at the bottom 20%, complete legit. The problem being, the bottom 20% of the men (without mechanicals), would still usually be no farther back than 10-15th in the women's class.