My interpretation of these words is following: Souls' fortune is the human body a soul occupies. By forsaken, Shade means those who abandon their body like for example those who commit suicide and really die (not like Amaria who survived). And a soul is bounded to the human body until it loses it's function of sustaining life (Life being a symbioses between soul (psychic part) and human body (Physical part)), in other words a soul can only escape from a body by physically damaging it, by death. Otherwise, suicide would be useless because a soul could just vanish from it's human body. That's what I think xD.
Therefore, I guess that it won't be just 2 people out of 4 dying like many think, but it will be 2 of those "forsaken" bodies being "taken" (collected) by Shade (Like what happened to Corey). Kiki is dead, but I didn't see Shade collect the body because she didn't commit suicide. So I think there will be one more person committing suicide, and there's now only one screen left out of the 4 Shade mentioned
Anyway, there's still one thing intriguing me and it's Shade. I don't see what he could possibly do with a human body. We see that he has a Gengar named Corey in his team, but it would make more sense for me if Corey's soul is trapped in the Pokemon. Shade could also mean, that the souls itselves will be taken instead of it's "forsaken fortunes", but then I wouldn't see the point in him collecting the bodies.
And now I'm trapped and I don't know how to continue my reflection as well as where I could correct it in order to see the logic in it again xD