The key factor to consider here is that Suzuki and Happ were given full no-trade clauses as an enticement to sign. That doesn't necessarily make a player immovable. But for example, if Suzuki simply doesn't want to play in Seattle under any circumstances, that's that.
Suzuki, 30 in August, has matched his career average with a 122 wRC+ this season. Despite increased strikeouts, he hit the ball well in June. His right field defense has been subpar, but not a total killer. He's been something short of a 3-WAR player per 140 games.
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