2 things...
1)The organization matters. Great athletes in mediocre organizations under-perform more often. Good athletes in great organizations over-perform more often. The world is starting to see that PC/JS have a track record of players having the opportunity to over-perform in Seattle if they follow the system. Of course there are examples both ways, but the biggest stories out of Seattle in the last 12 months are Geno's success and RCW's failure. It paints a picture.
2) There's an appeal to a player(s) that voice(s) their preference to be a Seahawk. To me, there's also an apprehension regarding a player that gets everything they want when we've observed that players with a "chip-on-their-shoulder" mentality tend to fit better in Seattle. A sense of entitlement is a killer in PCs "always compete" atmosphere. I'm not saying this specifically relates to NSmith. I don't know and don't have an opinion. However, if he ended up being a higher draft pick than he originally expected and ended up on a team he preferred, he wouldn't be very motivated to prove doubters wrong.... I think this scenario has been a problem with some high picks in the past.