I think we're all thinking the same thing after that last enlarged photo showing black charing:
The oxygen ignited from a spark (perhaps in the adjacent (e&e) electrical bay) caused an explosion yielding the sidewall, causing the decompression.
The decompression snuffed out the fire before it could it could get burning significantly. The debris we see hanging out was sucked into place after the tank, sidewall and fairing fell away in the slipstream; hence, it shows no evidence of scorching and fooled the chit out of us for days.....
Plausible?
pac "Sherlock" plyer
You can enter your horse in the race if you want, but you don't need to immagine that you see charing in a photo to speculate that partially confined oxygen between a blanket and a side wall could ignite for a second and cause a local overpressure. Just use the "could have" and the ripped out lower rivet line.
Maybe we can get "Myth Busters" to run this experiment