Or you could look at the Blues roster that won a cup and count the number of players acquired and developed after he took over the organization at their lowest point.
Columbus lives in a world of mediocrity because we can never collect high lottery picks.
Ryan O'Reilly - traded for well after J.D. had left
Jaden Schwartz - drafted in 2010 (J.D. was there, I don't think Jarmo was there anymore)
Alex Pietrangelo - drafted in 2008 (J.D. was there, Jarmo was still there I think)
Vladimir Tarasneko - drafted in 2010
David Perron - sure, drafted in 2007 by St. Louis, but was traded to Edmonton in 2013, then traded to Pittsburgh in 2015, then came back to St. Louis, then drafted by Vegas, then back to St. Louis a 3rd time
Tyler Bozak - signed as a free agent in 2018
Brayden Schenn - acquired via trade at the 2017 NHL draft
Colton Parayko - drafted in 2012
Oskar Sundqvist - acquired via trade at the 2017 NHL draft
Patrick Maroon - signed as a free agent in 2018
Vince Dunn - drafted in 2015
Jordan Binnington - drafted in 2011 (not sure how much credit you want to give J.D. here)
Over half of their top 12 or so players from their Stanley Cup team were acquired after J.D. left. So does he get credit for laying the foundation or is it a mark against that they become consistent contenders (and won) after he left?