Trouba has been discussed ad nauseum in this thread. Do a search and read pages and pages on it.
I will just remind everyone, again, that Trouba's wife has a medical residency in NY. They don't want to go anywhere right now. When that residency ends, maybe, but for now he has been clear he doesn't want to move. He's on an M-NTC right now, and I'm sure that includes SJ. He'd have to waive the NTC, but for those personal reasons, it's not happening. He could be waived right now and the Sharks claim, but right now the Sharks actually don't have enough cap space for him.
It's only realistic to consider Trouba to the Sharks when he becomes a UFA in the 2026 offseason. Then I'm sure we'll get a ton of discussion as to whether the Sharks should sign him as a "veteran presence" or something.