Finn isn’t the only one who has his history delved into.
“I would say that each of the characters get more light shed on their histories. I’m not saying we get full, exhaustive downloads on all of their childhoods and every major step that got them to where they are. But there are a lot of questions about Finn’s past, about Poe’s past, obviously Rey and Kylo, and then some of the new characters we meet.”
Poe’s past has been looked at in his own title and in the Shattered Empire limited series and obviously Rey is subject to all manner of rumours and hearsay.