If ghosts in the MoRverse are essentially echos/final states of someone, while they perhaps aren't people, would they effectively implicitly encode the final brain information, thus, while not exactly the person, would essentially contain the person "in storage/paused" (ie, act as a magical equivalent of cryo)

This seems to suggest that if you are going to die, make sure you do so in a traumatic, angst ridden way. Get yourself ghosted. Then if someone creates a Friendly Magic-Gaming AI they can go ahead and synthesise you into a corporeal body. And if they refuse then you can haunt them and throw a dust spec in their eye once a year for 3^^^^3 years of the magically extended life of the universe.