Friends of us (I'll call them Team PSI) have a whole world inside, with politics, economy... so all of them have their own life in this world, their own background story too.
All of us here have a "past life" of some sort and are working on integrating the reason why they are here, into their own life story. We do make the difference between what happens to the body (the objective life) and the way we use stories to make sense of ourselves (the subjective life).
Some exemples include:
Zami is in the body through (re)incarnation process and lives a human life in order to study being human from the inside.
van H. and wife died in their "past life", and this is now their paradise.
Wolf died too in his "past life" and has not yet figured out why he's here, and does not seem to care yet.
Ulysses has used too much of his memory-altering abilities on others in order to protect himself, and made his world "glitch" and he "fell through the glitch" and now is here.
X did bad things in his "past life", started taking actions to redeem himself, and his god has granted him one more redeeming chance by participating in taking care of the body.
Most of the others just don't care. They have "past life memories" of another life, and now they're here, okay cool, they just recreate their "past life" in the WorldTree and carry on.
So, it is not surprising at all that your husband's latest arrival has a background story of a sort. Our life stories are part of what makes us people. The way we gather our life events and express them and tell our story, also is part of what makes us people. Boris Cyrulnik (a neuropsychologist) explains this better than me. "Whispering of ghosts" is the latest we read from him and I KNOW it exists in english. It is one of our favourites, with the "Autobiography of a scarecrow" one and his own autobiographic one (Life is calling for you), but I am not sure if they exist in english.
All that to say, it is normal that people come with their own life stories. Because they are people. Does not matter if they are new in a brain, or not. It's part of what makes us, people. We tell our stories in order to exist.
~Theia~