Look at where Seattle's top players have come from, and you'll get your answer.
Bjorkstrand: Francis absolutely fleeced Kekäläinen in a trade, who - quite frankly - chose the wrong guy to keep out of Laine and Bjorkstrand.
McCann: there was a trade involved with him prior to the expansion, but the Leafs literally protected Justin Holl over three additional forwards.
Dunn: the Blues managed to not only lose Pietrangelo for nothing by signing Faulk to an enormous contract before AP became UFA, but they also protected Faulk over Dunn, promptly losing the better defenseman for nothing. Not a single modicum of foresight was used there.
Eberle: the Islanders protected Clutterbuck and Martin over him. 'nuff said.
Larsson: I can't say this was as bad as the four guys mentioned above, but when your protection list includes no less than five fringe NHL players (at the time) that are no longer on your roster, something might have gone wrong.
Sprong/Tolvanen: they're not necessarily top players, but they reinforce the point that is made here: other GMs around the league are, at times, absolutely useless at recognising the talent that they have in their organisation. These are essentially two 20-goal guys playing for a combined 2.3 million, who the Kraken got for nothing from organisations that somehow didn't see value in having them around. Heck, we just had a desperate GM pay five draft picks for a worse player at the deadline, yet these bargains are still available league-wide. Seattle (and Vegas) have made use of them; the same cannot be said for everyone else.
Many thought that Vegas was a one-off with how they executed fantastic trades in the expansion draft. But Seattle, on the other hand, didn't do that, yet they still have managed to find great talent from multiple sources (FA, waiver wire, expansion etc.) in just two years.
Other GMs should take notes. They're the ones allowing this to happen.