Dombrowski's one failure in building this year's team (and I have said many times that he did a great job building this year's team, with a lot of help from Ben and Theo, of course) is the lack of depth. In particular, he did not plan out our 3B situation well.
Guys like Holt, Rutledge, and Hernandez are good bench players for short day to day injuries or to give players a breather. They are not viable replacements for longer term injuries.
My biggest concern for this season, although it wasn't a huge concern, was the lack of overall depth. We need Pablo and Hanley, as well as Holt, to get 100% healthy, and things will look better.