If his numbers have taken a major drop because of fatigue, how do you know that one skipped start is enough to turn him around?
It's possible that the Guardians have figured him out. The two games against them is enough to skew his numbers for the last 6 weeks.
He hasn't given up more than 4 runs to any team, besides the two games against the Tribe.
I'm more inclined to believe that he's tipping pitches, rather than he's feeling tired whenever he faces them.
You could give him a week's rest and the Guardians will probably still light him up in the playoffs.
The Yankees (the other team that has given him fits lately) have hit him pretty well too.
When he gave up 8 hits and 3 runs to them in May, was he tired then too?
Rant as much as you like, but the Sox are going to do the right thing and concentrate on winning the division, THEN worry about the playoffs.