We used 10 starters over the course of last season. When Scott Feldman spells Matt Harrison, he will be only the 7th starter we've used this year, the other one being Dave Bush, about whom the less said the better..."thanks for being a body when a body was needed" should suffice.
This rotation has been better in terms of consistency, durability, and endurance than anybody could have expected (in terms of both franchise history in general & what we knew about them going in to the season), but yeah, they're starting to look tired, and it is time to start making allowances and considerations, especially for the back three of Harrison, Ogando, & Holland, who are all in uncharted territory as far as season innings pitched.
Regardless of the final outcome, they have been an inspiration to see grow, struggle, and develop, although on occasion Derek Holland seems to forget that this isn't some sandlot slowpitch game...but his ceiling seems to be as high as his floor, so...hopefully he grows up sooner than later, and with the Rangers instead of somebody else.