Re: Why did Veninx want Hybrids?
 

Judd had no idea about Eddie's ending. He was just trying to end the season to the best of his ability and on a tight deadline.

Re: Why did Venjix want Hybrids?
 

Think of the Hybrids like Terminators. In the first Terminator movie, Skynet's 600 series had rubber skin, so easy to spot the fakes. Venjix may have tried something similar before the world was taken over, but people saw through it. Enter the T800 series; infiltratiors given blood and flesh, but metal underneath, able to blend in with others unless detected by dogs; this is similar to Venjix using Hybrids; perfect infiltration.