If you had to find just one reason for the demise of a team 11 games over .500 pre A-S break, it probably is the 18 blown saves after the break. But it was the perfect storm of starting pitching in late July-August ( later recovered) , a team wide epic batting slump in September , poor infield play (errors) , excessive Hr's allowed, and no significant pick ups at the deadline, in fact, negative pickups for relievers
Going 4-3 vs White Sox didn't help . Swept by O's, Dodgers, Mets. Just win one more game every other month would have put them in.