We couldn't keep JvR. That is not on Dubas, it was never going to happen.
Bozak is not a difference-maker. Polak, Martin, and Komarov is replacement level players who makes no difference for anyone. What they provide, they give back in other areas. They were replaced by other replacement level players, with the same kind of flaws. I don't see how you can argue that this is a big difference maker. Unless you think teams can't win without hits. Chicago won three times without hitting.
What would be a big difference maker is adding one of the best players in the game. Or adding a top pairing d-man. That's the kind of things that make a difference.
The reigning champs have a lesson to teach there. Kuznetsov was all you accuse Nylander of for years, and then he was a Conn Smythe runner up when they won.
Keep the talent, and let them gain enough experience to become a force in the playoffs as well. It might pay off huge down the line.
When The Point showed some of their player tracking data, the guys who caused the most turnovers on the forecheck was Hyman, Marner, Matthews, and Nylander. I agree with you, time and space is key. You remove that by closing fast, not by finishing checks.
Criticizing Nylander's transition and chance creating is pretty weird.