It helps (a bit). I presume that the cylinders shown are not in the location of the 'missing' cylinder.
We really need a view more to the left to see the depth of the space in which the oxygen cylinders (of this aircraft) are positioned (and hopefully showing the support bracket).
I appreciate that the upper support is unlikely to break away, so the cylinder will be restrained in its original lateral position, but if the lower support fails . . .