IMO, guys like Moore, Schaller, Nash and Liles are one of the reasons this team is where they are right now. The margin for error when it comes to goals for/against and how it affects wins & losses is so small... Compare this current group to our -20something 4th line of kids last year, and the difference is night and day. These guys are dependable in their own end, which means they take pressure off the defense. They help out on the PK, and they've also contributed with some offense of their own, scoring 8 goals in 18 games. Heinen was second only to Czarnik in terms of being the best rookie in training camp, and he went 0 for 7 games.
These guys don't take up any more cap space than a rookie, and they're not signed long-term so if a guy like Kuraly or Acciari come into the lineup for injuries and show they're as good or better, then that gives you depth now, and the ability to transition to those younger players next year. Whereas if we go into a season depending on those kinds of unknowns to deliver (like we did last year) and they struggle (like they did last year) then you start every game spotting the opposition zone time, scoring chances and goals.
Honestly, one of the reasons I was more optimistic about this season was the upgrades made to the 4th line.