TB, once you know the what, and who was in charge of the baseball and/or business operation when the what happened, then the how and the why become immaterial.
You're right that multiple things need fixing with the organization, all the more reason not to waste time on getting the right executive team in place. Get good leadership in place and let it start sifting through the underlings and processes. Like I said, Castellini didn't have to sack Allen and O'Brien yesterday, but if he had done it, it would have been to roaring approval.