If winning games (by trusting vets in key situations) is the priority, I would ask why? Ducks aren’t making the playoffs and are in a rebuilding year. LaCombe was given the chance to earn trust and took advantage. Others won’t get to that point until they are allowed to play in those situations.
Actually, LaCombe earned that trust prior to the end of games. He was also put into a rotation to start the season. All of our youth D have closed out games to start the season, but it's a recent development to close out games with our Vets + LaCombe.
Early Season
We see LaCombe having the fewest ATOI among the youth D because the team was bringing LaCombe along slowly after being sick for over a week.
Recent
Things have drastically changed since the start of the season. Zellweger is more sheltered (OZ Start%) as a top-4D and Minty has struggled to play defense. The fact that Helleson's CF% is better than Minty's CF% should speak volumes. But Helleson is also sheltered (3rd pairing TOI), though his DZ Start% is similar to Minty's.
With the addition of Trouba, there is a better balance of LD/RD pairings. Before Trouba, we had LD Fowler. Gudas, Trouba, and Dumo have the experience while LaCombe's has shown the capacity to handle defensive responsibilities.
Right now, Minty and Zell need to show better defensive responsibilities in order to earn to close out a game. With Helleson, probably more game experience, but I'd rather put him in at the end of games to secure a win than Minty or Zell.
We can develop our youths while also instilling a high standard in order to close out games. This is a normal thing as we have witnessed it under both Eakins and Cronin.
OT time
Lost in all this is the fact that when it does go to OT, then that is when our youth D gets implement over the vets. I witnessed the rotation of LaCombe and Zell for OT in one of our recent games. OT is more pond hockey than a structured game. Both LaCombe and Zell are our fastest d-men skaters. I can see Minty in for Zell too.
This reminds me of the 2022-23 season. We just needed to get to OT to deliver wins. Our team roster sucked as a whole, but once in OT, then our top-end guys matched well with the opponent's top-end guys. Our top-end guys were our youth. Over 60% of our points share was generated in 1-goal games that season: 14-7-12 (40 points).