I think the 2015-16 roster had a lot more positions open. Looking at our depth, we are littered with NHL players in a way we weren't in 2015. Dupuis retired and Porter broke his leg. Then we HS'ed and later traded Plotnikov. Those negatives created the catalyst needed to get those young kids up.
If Rakell retired, Hayes broke his leg, and we traded Acciari - we'd still have Puljujarvi, Poulin, and Puustinen available before we had to dip into Pono, McG, Broz, etc.
An early season priority for Dubas should be "creating room". You jettison Eller, Nieto, Acciari - you now have room for these younger guys if an injury happens. More over, unless one of them is killing it, I'd like to see 2-3 young kids up on rotation and getting games here and there. Basically the "Anti-Harkins Doctrine" and back a little closer to when it was two of Rust, Sheary, Wilson, Kuhnhackl being brought up at a time and rotated.