All we can do is do what we do: speculate (this is why some posters need to relax... unless, of course, they're secret agents planted here by the Red Sox PR dept).
With Seager, maybe there was a bidding war -- it only takes two. And maybe, both were division rivals...
... or one was the Yankees, who maybe preferred Seager for his lefty swing to aim at jokefield in Yankee Stadium... and for his non-Correa villainous Astro history. If there was any club that had reason to avoid Carlos, it was NY, especially after he dissed Jeter's D (omg).
Btw: re. Story, we really shouldn't be that surprised by his horrendous nightly swings and misses -- now in his 7th year, his 162-game average is 190 strikeouts. When I was a kid, Bobby Bonds set the all-time single season K record with 189 in 1970. The bigger problem with Story is he almost has twice as many whiffs as hits: 41 to 22.
But a bigger total shock has to be Marcus Semien, with only 20 hits, zero home runs, and a .157 batting average. This was a star hitter who not only just set the all-time HR record for second basemen, but a guy who was third in MVP voting for two different teams in two different cities the last two full years (no Coors factor there).