I always thought the big twist for Pentious would be that the eggboys are actually the souls of people who died because of him. Maybe there was a preventable accident on one of his projects that left them with head injuries—hence the cracks on their shells—and he kept them around out of guilt or pity.
The setup could be something like: Pentious is working on a big job, gets a letter about stricter safety regulations, but he’s too strapped for cash to make the changes (greed). He ignores it, the accident happens, and the workers end up dead. So he ends up in hell, not for anything he did outright, but because of his negligence. Maybe he’d eventually have to face his greed to redeem himself and ascend.
It would make a lot of sense if the eggboys represented people who mattered to him, given how much he cares about them. Unless, of course, they somehow tie back to the victims of Jack’s crimes. Maybe they're the dead prostitutes he saw get murdered? I think one of the characters sexed the Eggs at one point and saw one wasn't male? I dunno—but if that’s not the case, I’m not really sure what their overall purpose is.