Interesting thought experiement. Dubas definitely went out and got as much experience around the edges as he could. The thing is though, the lack of killer instinct is at the core and this team has fully proven that it will only go as far as the core will take them. The defense was great, the goalie was great, the depth did their job well enough, it's the core that failed to produce and it is in the core where we need to inject that killer instinct. Muzzin is really the only core piece we have with real winning pedigree, and he's on the periphery of the core.
Ultimately, I feel like this is yet another thread that boils down to "Marner sucks in the playoffs". To me at least. JT was injured, but has been good in the playoffs for us. Matthews couldn't score, but he was working hard and has been our best player in multiple playoff series. Nylander was terrific. Marner was a big yikes and has been for three years in a row now. I think if Marner gets sorted out mentally (may not be possible) these things solve themselves.