Byfield, Clarke, Laferriere, Greentree, George, Turcotte, Kempe, Spence, Anderson (top 10 contract in the league?) and future 1sts are all tradable assets with varying levels of value around the league. They can put together a package using those assets to acquire just about anyone who could conceivably become available on the trade market.
There's also a huge difference between a team like the Sharks or Blackhawks having cap flexibility and a team like LA - which just finished 6th overall in league standings - having cap flexibility. LA is already a playoff lock and outer-circle contender that projects to have $50 million in cap space in 2026-27 with the majority of their roster already signed. McDavid, Eichel and Kaprizov are all legitimate targets for the Kings in a way they will never be for smaller markets or even destination cities that haven't managed their cap space as carefully.
The original PLD trade was damaged goods Vilardi, negative value cap dump Iafallo, Kupari the bust and a late 2nd round pick. Vilardi only established himself after he got to Winnipeg so that's barely any value going out at all. If not for PLD informing the Jets he would never sign with them long term there's no chance LA would have even been able to acquire him with such an insignificant package, let alone someone better. If anything, the Jets are lucky Vilardi has managed to stay relatively healthy and been a perfect fit on their power play or else they'd have nothing to show for PLD and the Laine+Roslovic price they paid to get him.
We don't know what the Kings are going to turn into post-Kopitar because we don't know how they're going to spend their mountains of cap space. This is not a serious consideration for teams/cities nobody wants to play for like Calgary and Minnesota but it is for LA.
Yzerman has been on the job exactly 3 years longer than Grier. I hate to break it to you but the Sharks will need to get enormously lucky just to become a 85-90 point fringe playoff team by 2027. If we're not a playoff team in 3 years, or even fall short of what the Red Wings have accomplished, it won't be because Grier did a bad job. For both GMs, a ~decade of futility was already pretty much baked in thanks to the incompetence of their dumbass predecessor.