I agree the season to date has been better than expected during spring training. I don't think the Sox have quit in any way shape or form.
I do believe, however, that they are no longer the team that led the AL East and the AL back in July (and for most of April-June).
And the reason for that is pitching, pure and simple. Other teams have it, but the Sox don't. That means the Sox have trouble hitting other teams pitching, but other teams don't have a problem scoring off the Sox pitching--and, secondarily, off the Sox defense.
In the past, the fix was simply to go out and buy some pitchers, often at any cost. Maybe the Sox need to examine their entire system for evaluating, developing, and acquiring pitchers.