I really respect your scouting and feel you have awesome insight into prospects so please don't take this the wrong way.
I was really curious about this and from the 2014/15 to the 2021/22 where Benning was fired (8 seasons), 41 U23 players played their first game on the Vancouver Canucks roster. Of these, 9 were U20 (Horvat, McCann, Virtanen, Boeser, DiPietro, Hughes, Pettersson, Hoglander, Podkolzin). The 41 players combined for 2362 points for the Canucks, the 9 players combined for 1712 points for the Canucks.
From 2008/09 to 2013/14 (6 seasons), only 21 U23 players played their first game on the Vancouver Canucks roster. Of these, 5 were U20 (Hodgson, Sauve, Kassian, Corrado, Jensen). The 21 players combined for 364 points for the Canucks, the 5 players combined for 102 points for the Canucks.
Now, you can take off Horvat's 420 points and add them to Gillis' totals, plus another hundred or two (overestimating) for guys like Hutton and Gaunce who got carried over but we're Gillis' picks - but the fact is Benning was more successful at adding young talent to the team. I totally recognize that the team was a cup contender under Gillis and a perennial bottom feeder under Benning, and Benning is an idiot, but I just wanted to present the facts