I doubt they're worried about overtaking the Rays. I see it as a situation that they'd care about only if there's a sign that the Rays are self-destructing. Maddon should be the manager of the century for his performance this season.
I think they'd be more inclined to worry about the Twins or White Sox....and the Yanks have to be in the back of everybody's heads.
If they get any distance in the wild card race I think we'll see some rampant resting of starting pitchers and position players. It seems to be Francona's way of managing. Can't argue with his success.