I explain it above.
The documentary is an excellent one and explains it fully. If you don’t want to watch the whole thing, go to 1:15 and watch from there.
Thank you. The missing Zuni missile from Lt. Bangert’s plane was probably a pretty big piece of evidence as well. That had to be explained and most likely neither the fire nor the bombs exploding across the deck were potentially suspect as causes for that at all.
And since the investigation did find the exact cause of the Zuni missile malfunction, which was unrelated to external heat or concussion, it would have been by nearly miraculous odds that the missile malfunctioned at precisely the same time as a separate unrelated catastrophe was occurring on the other side of the deck.