So Zeus is capable of growth where the other gods are not. Zeus also has his eyes on humanity to be something special. After we factor in Prometheus, Pandora, all the heroes, especially Hercules and Diomedes, the guy has been planning something big. But why is he maneuvering behind the scenes? With Pandora he concocted the idea that it was all a punishment. Why?
He hid his involvement with heroes behind adulterous affairs, playing them off as nothing important beyond them being his children. He didn’t raise them or pay any special attention to them. Why?
Well, as we’ve seen, the Greek gods are pretty petty. They lash out and inflict horrible punishments on mortals for small crimes (poor, poor Teiresias). It’s just who they are. Not only that, they fight amongst themselves. If they’re not lashing out at mortals who committed crimes, they’re arguing with one another . . . and lashing out at mortals in the process. In that respect, they really are a family, as some of the worst fights in history happen inside of families.
Now, you’re Zeus (temporarily, so don’t let the power go to your head or other places) you have a plan. It’s a cunning plan. An intricate, cunning plan involving humanity that will take hundreds of years (maybe thousands), requiring constant nudging in the process. It’s very delicate. At any point, the whole thing could just collapse, and it’s back to square one.
Do you tell your family, who are fond of fighting with one another? Let’s not forget their habit of transforming and punishing humanity on a whim. What are the odds that they are going to think that this intricate, cunning plan is a good idea, especially since it favors what the gods consider to be lesser beings? What are the odds that they would understand this plan in the first place? I mean, I think Athena would get it, but I’m not confident about the others, especially Ares or Dionysus.
He doesn’t have a choice but to hide his plan because the others wouldn’t support it. They would completely screw things up because they can’t get along with one another or because they want to punish humanity. Zeus has to maneuver in unexpected ways, covering his tracks with other actions. In this respect, he’s absolutely brilliant. He disguises the creation of humanity’s role models with his own affairs, creating the illusion that he cannot control himself, that he is a slave to his own passions instead of carefully maneuvering things just right.
Pandora, including all of her godly gifts, will be a punishment to humanity because she’ll let loose the plagues that will ultimately teach humanity to overcome adversity, to rise to any challenge, up to the point that Diomedes can openly challenge gods on a battlefield.