He's not blameless, but way down on the blame list, below these problems:
1. A decade of generally player drafting and development;
2. Meager results from a decade of international signings (Iguchi, Alexei and Viciedo are the best we've done);
3. Going "all in" in 2011, with core players having career worst years, and Ozzie quitting mentally early on when the season remained salvageable;
4. A series of trades that further depleted talent and yielded mediocre returns;
5. An organizational culture that privileges loyalty over performance excellence, and seems to be behind other teams with the use of data analytics.
All of these things create a climate in which very few managers could succeed.
The universe is the practical joke of the General at the expense of the Particular, quoth Frater Perdurabo, and laughed. The disciples nearest him wept, seeing the Universal Sorrow. Others laughed, seeing the Universal Joke. Others wept. Others laughed. Others wept because they couldn't see the Joke, and others laughed lest they should be thought not to see the Joke. But though FRATER laughed openly, he wept secretly; and really he neither laughed nor wept. Nor did he mean what he said.