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That either you were expecting a bad team to suddenly be great by adding a bat or went into it with other expectations that were as unlikely.
If you're only checking teams that made world series runs. Discounting any that were already good before adding a bat. That leaves only an expectation that bad teams could suddenly be world series bound by adding a bat. nobody else seems to be saying they'll get to a world series next year if they add a legitimate bat, so I fail to see how the research even applies to the mariners position.
If you're looking up teams that start with more things in common with the Ms, then added a lineup legitimizing bat and seeing how much they improved it would seem to fit more to the actual, situation.
Not that I didn't learn anything from your research. Just don't think I learned much that applies to roster construction from the 2013 Mariners.