You cited 2017 drafted D men. The fences are changing in your arguments. Regardless, let's correct your earlier statement of 3 D men from the 2017 draft are playing in the NHL.
There are actually 7 2017 drafted D men that are playing in the NHL 8 if you include Brannstrom who played 33 games in the NHL before being sent down.
Heiskanen, Makar, Brannstrom, Valimaki, Jokiharju, Hague, Ferraro, and Fleury.
So while you like to point out Lilegren leads Foote by 2 pts in AHL scoring for D men.
Other teams already have players that are better, and no doubt would be bettering 24 points if they were in the AHL. Which is why making a big deal out of it, as you have, is silly when you most of the better players are not in the AHL.