Seems like you've "neglected to mention" some stuff too. He took over a team that was 7th in the league, not 6th (it's weird you didn't look at the tiebreaker since you've been sure to be very specific about us not being top-5 this year because of a tiebreaker) - a 105 point team propped up by the simultaneous combination of good health, unsustainable shootout luck, strong starting goaltending, and a 35+ waiver claim backup fluking into a career Vezina-level season. That team was set to lose significant depth to UFA in the offseason, and the pipeline had been sucked dry and gone unreplenished.
Now, with Matthews/Marner/Nylander off their ELCs and costing tens of millions of dollars more, and that starting goalie imploding, and without the health, shootout luck, or unsustainable backup goaltending, we've actually improved to 6th in the league, and won our division with a 113 point pace, on the back of strong, sustainable underlying metrics. Despite being in this competitive phase, we have had more draft picks under Dubas than the default, and our prospect pool is in good shape.