I see it as a time contraint issue.
We all know Buchholz can't be in the rotation for the forseeable future.
But, with no viable replacement in-house, he becomes an problem with no immediate fix.
If Price were providing some ace-like performances, the Sox may have some time to get a deal done to fix the back of the roation.
With Price being merely average, it puts a real crimp in the amount of time available to get a deal done.
Without some shut down perfomances you'd expect from an ace, it may to be too late to fix the rest of the rotation.