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Doc...you do know that the Mariners' home park plays havoc even with defense independent statistics, right?
Safeco's HR factor, for example is off the charts compared to the rest of the AL...only Oakland is close. The 2001 Mariners were well below average at preventing longballs once you account for park.
They were also only average-solid with their K rate and that was seriously inflated by their good bullpen.
I see a team that allowed a lot of HRs (relative to park), had an average K rate, and an above average (to the good side) walk rate. That's, by definition, an average pitching staff. Well above average pen...slightly below average rotation.