dr dre
If the oxygen bottle has ruptured in cruise, resulting in extensive damage to the electronics bay and a gradual decompression event ensues, then the cabin altitude warning will NOT occur straight away, it would occur some time later. The cabin altitude starts to climb gradually. However, the crew will be bombarded with immediate failures, especially anything electrical and reliant on P105 & L AIMS eg 4/6 DU failed. They would be definitely overloaded mentally. Whilst they problem solve, it would be easy for the crew to be task fixated on a problem and miss the gradual decompression event. Considering both pilots were smokers, their lung capacity would be equivalent to a much higher altitude when the Cabin Altitude message finally appeared at 15000feet.
I thought that's what I tried to explain. I'm surprised at the resistance to the simple logic of the technical and physiological aspects of that part of the theory.