that means very little, since a soul does not define a person.
I think if anything can be said to define a person, it's their soul. And that statement kind of falls flat when you consider the people we know to be shards of each other, and see that they all share major similarities. Yes Ardbert grew up helping others in a small village, but it's hard to say that he wouldn't have ended up a helpful adventurer anyway given that WoL can quite literally be anyone from anywhere and they turn out the same way. It's pretty much impossible to buy the idea that one's soul is meaningless when we meet people like Grenoldt, Mowen, and Taynor on the First.