Truly good forensic knowledge has been contributed to these many posts.
"The only thing that worries me is what caused the O2 Bottle to rupture in the first place to have it rocket into then out of the fuselage?"
Was taught in A&P school that one of the closest lethal combinations to create a near spontaneous combustion, was the proximity mix of aviator's breathing oxygen (color coded green), with aviation Mil-Spec grease, no matter how small in quantity. (note - aviators breathing oxygen is simply medical grade oxygen (color coded grey?) with moisture removed).