Just heard some interesting behind-the-scene comments on the Leafs' draft.
In Friedman's
31 Thoughts, The Podcast: NHL Draft edition - Sportsnet.ca, Kypreos claims that if Hunter was in charge, he wouldn't have traded down. Instead, he would've made the pick, and the pick would be the defenceman Nicolas Beaudin (with Marek/Cosentino/Friedman agreeing that Beaudin would be the pick).
Apparently, Dubas has a reputation of being a trade-down guy and Hunter has the reputation of just making the pick. So even back in 2015, Hunter didn't want to trade down from the 24th pick. (Who would he have picked instead? Jacob Larsson?)