After slapping the mark of Soul Slave on Zach, Blaze lets him go. He has no other useful information that Blaze can extract anymore. Blaze knows exactly what he is from inside to outside. All that is left is to complete Blaze's legion.
That's right. He is going to make an army of Soul Warriors. There is absolutely no reason for him to make use of these souls inside the Lantern of the Damned.
The redeemable one, he can grant them a new identity and body so that they can fix their mistakes.
The not-so-evil one, he can make them into his eyes in the sky, joining Isaac's scout team.
The sinful one, like Zach here, was only lost on their way. They can join the army of the souls that Blaze is creating.
The irredeemable one, well, there is only one end for them. That is to become Blaze's experience.
Blaze has time, and he doesn't have anything better to do. He begins to binge-watch the lives of all the souls inside his Lantern.
