Untouchable is Dame. He'll more than likely retire a Blazer. Not going anywhere.
Beyond that, I think next closest is Nurk, in what he brings to the team. We've been able to see the huge difference side by side with Whiteside, and what we were really missing this whole season. Obviously, you get a package of him and pieces for a better C, you take it, but I'd say there's probably 4-5 that fit the bill in the league.
I like a lot of the other pieces on our team, and prefer tinkering to wholesale changes, but I think anyone else, if the right move is there, you do it. I really like Trent, loved it when we picked him, but if you're starting him at the 2, you NEED to find a playmaker in that CJ deal. Comparing him to Matthews, it worked to have him at the 2 because we had Batum at the 3 who could create, and you had Aldridge at the 4. Removing CJ removes the only other player than Dame who can get a bucket consistently when needed. I'd run it back with minor adjustments next year, barring a blockbuster being available.