"But let's not rush things; whether he can grow to the level I need him to reach is still a matter of uncertainty. Moreover, before that, I need to make some more preparations..."
Waiting a bit longer doesn't really matter; a few years or even a decade is trivial for a deity.
Once he grows up, I'll test his abilities a bit more before ultimately deciding whether to entrust him with the important task of venturing into the Abyss to fulfill his mission.
After all, other places are manageable, even if troubles arise. He can fix them on time—Perseus managed it with the Divine Artifact of all Gods. But Tartarus is beyond his control.
Once entered, don't expect anyone else to offer help. Zeus doesn't care so much about whether the boy lives or dies now, but if he bungles his task in the future, that would create a very difficult issue."
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In the Mortal Realm, at the Acropolis.
