How much longer can the D-backs afford to keep Zach Davies in the starting rotation?

The Arizona Diamondbacks have a giant problem, in more than one way. After another disastrous start in a loss to the San Francisco Giants, Zach Davies outings have become a serious problem for the D-backs. Does the Diamondbacks front office need to make a change immediately? We also take a look at our updated MLB Power Rankings and more.