They were never afraid of bringing up talent, Provorov, Patrick and Konecky were 19 year old rookies.
But some players take longer, both Sanheim and Myers have been inconsistent.
And different circumstances, Lindblom dominated the SHL at 20, but for a guy with average speed, there's a big adjustment to the smaller NA rinks.
A lot of the players they brought up this year had NHL bodies but weren't NHL ready, but outside of elite talents, a lot of players need a couple AHL seasons, not unlike ML players who repeat AAA ball to work on their skills.