I think there was another possibility which does incorporate "cover-up" or "standup".
I believe a case can be made which characterizes Pres Bush as a weak president, surrounded by much stronger folks, who were more adept at politics and the understanding of politics than Pres Bush.
One incident I recall is his recollection of a conversation which included Tenet. Bush demonstrates his ignorance of the subject matter and relies complete;y on Tenet's assessment. I suspect in the arena of foreign affairs this was routine.
The other component of this equation is his belief that he was in fact the "decider-in-chief".
Looking over one's shoulder through the fog of time and delusional beliefs, I find that many folks can not recollect events with any accuracy. This could just as easily be a case of the decider-in-chief believing he was in charge and simply recollecting his distorted memories of an event for which he probably did not have much information.