The *correct* recovery from a spiral dive is power-roll-pitch IN THAT ORDER. I have certainly as an instructor seen a lot of pilots incorrectly applying pitch and roll together, which as an engineer I know creates a high potential for airframe overstress and breakup of the nature that happened here. Is this being adequately taught to FW PPLs?
The military rule we were taught was only pull two thirds of permitted "g" for a rolling pull out. Bit of a mute point when few civvie aircraft have a "g" meter.