Gibson has been quite disappointing, but he was almost OK in June and the team is essentially doing tryouts already for one spot in the rotation. Over the next few weeks, there is a reasonable chance that Santana could be traded, leaving two open spots. Santiago has not proven that he's any better than Gibson, and now he's sounding questionable in the clubhouse. There's nobody in AAA who's shown real potential. Much as fans may want Gonsalves and Romero, they're pitching well in AA, but not exactly dominating, and the team isn't going to rush them. If Gibson were removed, that would make two open spots with the potential for a third if Santana is traded. It is unlikely any team wants to have tryouts for two spots in the rotation, especially when they may open another spot. Therefore, unless and until someone else steps up, the best choice is to hope for the best from Gibson.
Right now, someone else means Colon and Gee. It sure would have been nice if Meyer, May and Stewart (and Worley) had worked out.
This of course is assuming they trade Santana and do not get anyone back in the trade that is MLB ready.We can hope that a second piece could be a lower ceiling MLB pitcher.