Jes, I think that upper management entrusts responsibilities and choices to employees. That's why it's so important to hire effective people. The employer shares some credit when the hireling proves effective, and bears responsibility and blame if the employee proves ineffective.
In the case of Stockstill and Fleita, both were hand-picked guys who were trained for their jobs under Hendry. And in the case of Fleita, Hendry has had ten years to evaluate his excellence as the farm supervisor.
Hendry has had plenty of opportunity to correct his employees or replace his employees if he didn't think they were doing things the right way.
So I think basically yes, he's responsible for what he did himself and for the guys he hired to do the jobs after he moved up.