I have in a previous incarnation worked on collision repair of cars and have seen how metal deforms in relation to various impacts. The kind of blow from inside by a downwards descending bottle would leave downwards stretch marks in the skin from above which are absent in photos posted on PPRuNe to date.
If the fuselage rupture was caused after the bottle went upstairs then how could suction have pulled the tank back down through the deck as Captain Kremin suggests ?
As Philthy notes by this time the hole was plugged by cargo.
For the accident investigator's theories to be correct requires the oxygen bottle to have performed several actions which defy the laws of physics.
They have approached the investigation having already made up their minds that the oxygen bottle flew around in the cabin and then directed their efforts to trying to make the facts fit their theory.
The energy required to make an oxygen bottle of such weight reverse course would have in fact been sufficient to shatter the bottle in which case the splintered fragments would have stayed inside the cabin.
Had the bottle propelled upwards through the hole and struck the door handle, the act of deflecting off the handle would have changed the bottle's attitude with respect to the hole.
If the bottle did not explode, but traveled upwards as an intact bottle then what caused the rupture at the wing root ?
Had the rupture at the wing root been caused by the bottle returning downwards how do you explain the suggestion that it was sucked back down before the wing root rupture ?
The energy required to make any massive object not only exactly reverse course are beyond the force which collision with a door handle could impart.
On the other hand photos posted previously on another thread here have show part of the lap joint where a whole row of rivets were bisected by a split fracture along the length of that row of holes. In other words the rivet line unzipped by part of the skin fracturing lengthwise along the rivet line. It is self evident in photos.
Had the rupture at the wing root been caused by the bottle returning downwards there would be vertical stretch marks on the skin. There were none where the rupture occurred.
