Not sure where you get 14 players evaluated by Kill/Claeys that were drafted - unless you are counting Ra'Shede Hageman and Brock Vereen, who were Brewster "evaluations". By my count, Kill/Claeys "evaluated" 12 players during their time at MN who would eventually get drafted:
Cedric Thompson (5th Round, 2015)
David Cobb (5th Round, 2015)
Damien Wilson (4th Round, 2015)
Maxx Williams (2nd Round, 2015)
De'Vondre Campbell (4th Round, 2016)
Eric Murray (4th Round, 2016)
Jalen Myrick (7th Round, 2017)
Blake Cashman (5th Round, 2019)(walk-on)
Carter Coughlin (7th Round, 2020)
Kamal Martin (5th Round, 2020)
Tyler Johnson (5th Round, 2020)
Antoine Winfield (2nd Round, 2020)
Given that Kill/Claeys were hired in December 2010, that means it took 5/6 years to get their first four players drafted (which makes perfect sense given recruiting cycles/player development). For perspective, Kill/Claeys did not produce/develop a single drafted player from 2011-2013 - which of course can be blamed on the Brewster regime's evaluations and not necessarily the fault of Kill/Claeys. Fleck/staff have only failed one year in which they have been coaching - 2018 - to have a player drafted.
Fleck was hired in January 2017. To this point he has put 3 players that he/his staff "evaluated" in the NFL (not to mention developed the entire 2020 draft class + Durr, who were all 2016 signees, essentially their whole careers) in what is now around the same time frame as Kill/Claeys.
Chris Williamson (7th Round, 2020)
Rashod Bateman (1st Round, 2021)
Benjamin St. Juste (3rd Round, 2021)
If I'm not mistaken, Faalele is a Fleck/staff identifed player that will most certainly be drafted, as is Mafe and Big O (admittedly, Big O may not be drafted but is getting some hype). JM Schmitz/CRAB (both Fleck/staff evals) would have been drafted had they declared/will be drafted. That puts Fleck/staff with at least 6-8 drafted players in around the same time frame that the previous regime had 4.
And really, your argument that the linemen Kill/Claeys identified that will now potentially be drafted (I'm guessing you mean Andries/Olson/Schlueter) should somehow be credited to that regime is weak - given the fact that there wasn't a single other lineman drafted under that regime's entire tenure, the players were developed primarily by Fleck/staff, and Fleck/staff will have at least two of "their" OL drafted in the next two years. Also, if you ask me, there's not a shot in hell that Tyler Johnson gets drafted if Kill/Claeys remain the coaches and I would credit Fleck and his staff with his development and eventual drafting, but that, of course, is conjecture. If you want to make the argument that Kill/Claeys were much better identifiers/evaluators of NFL talent, it is, at best, far too early to say that, and quite frankly, given the evidence, an incorrect assertion.