If Zodd was taken to the rebirth of Griffith...was there anyone else there at the ceremony?
A lot of people... *grins* most of them ending up dead of course, but for our purpose the only one that really matters was Gatts. Yeah, Gatts was there... *ponders USO implications*. But Zodd still picked Griffith... which was not suprising since an aspect of him sliced off his horn in vol 17...
And: Consider what the narration says when Zodd kneels before Griffith:
Then it was realized... The thing he sought had been found
I can only interpret that it is talking about the USO...