Hook chose to stay in the Underworld when the Orpheus and Eurydice-plan went bust. Do you think he’ll actually stay dead/down in the Underworld? If not, how else can the heroes get him back?
This one is a no-brainer. He will not stay there for good. There will be some magical loophole that will allow Hook’s soul to re-enter his rotting corpse (sorry for the description, just trying to remember what Hades said) and for his body to be revitalized and reanimated with his soul in it.
It might be something to do with a reward from Zeus for his tremendous sacrifice etc etc.