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I think I'd rather get the 4.5 wins in a full season...here's why.
This particular Mariner team was like .850 when allowing fewer than four runs. Their offense was reasonably effective and consistent, their team defense was solid, and they had a decent bullpen for most of the season other than April/first half of May and September. This iteration of the club doesn't need nuclear to win.
Also...our replacement pitchers are sub-marginal. Our depth is actually quite poor.