ttcse
Assuming those triangular support members are on top of the gallery as it's installed in the aircraft, the bending and the puncture of roof of that gallery section seems to say either:
x) it was somewhat inverted when it struck the water (whether within the intact airframe, a part of the airframe, or by itself) or
or alternately: the fuselage was slightly rolled and the fuselage stopped quicker than the galley when it hit the water
deSitter
In that case the large concentration of weight in the engines could provide a sort of gyroscopic stabilization to the spin.
the engines are unlikely to survive intact on their mounts in a spin (PA103, TWA800 etc.)