If dying was required to create a soulstone, we can surmise something pretty important: A soulstone isn't required to become a job, otherwise there would never have been one in the first place.
I tend to also go with the materia-like option: Someone dedicated to learning their skills and practicing them with a sufficiently-receptive ornament leaves behind a sort of... Hm. How to put this...
It could work like a Bourne Identity thing: Your character just begins performing feats or stances or maneuvers that somehow seem ingrained, based on someone else's memories of having performed those same feats years prior.
Or, it works like a D&D skill bonus: Someone might have been able to Jump through rigorous training, but a Dragoon soul suddenly makes them pros at it.
Or it works like downloading new information, and you suddenly get access to new skills and mastery.
At the end of the day, we're really only shown one specific example of how soulstones work. The Warrior of Light's perspective: A gifted and blessed individual comes across a new stone having only barely set out in a given profession and endures specific circumstances to awaken new memories. We can't really do anything but make reasonably-safe assumptions as to the greater system.
I tend to also go with the materia-like option: Someone dedicated to learning their skills and practicing them with a sufficiently-receptive ornament leaves behind a sort of... Hm. How to put this...
It could work like a Bourne Identity thing: Your character just begins performing feats or stances or maneuvers that somehow seem ingrained, based on someone else's memories of having performed those same feats years prior.
Or, it works like a D&D skill bonus: Someone might have been able to Jump through rigorous training, but a Dragoon soul suddenly makes them pros at it.
Or it works like downloading new information, and you suddenly get access to new skills and mastery.
At the end of the day, we're really only shown one specific example of how soulstones work. The Warrior of Light's perspective: A gifted and blessed individual comes across a new stone having only barely set out in a given profession and endures specific circumstances to awaken new memories. We can't really do anything but make reasonably-safe assumptions as to the greater system.