IF those staffers are not keeping him up to date that is poor on their part and they should be called out to explain. I say IF because there is the chance denying he knew was the quickest way out of the situation and there may be more to the story. Additionally, ignorance, at least IMO, is not necessarily a valid defense for the guy charged to run the show and whether it is poor hiring/retention or poor management, it is still poor. Just observing, the questions are continuing to stack up all around the department, again IMO.