the logic of the witch clones make no sense to me:
they use magic power to maintain the seal, so why are they trying to get a child with the strongest melee fighter?
The clones didn't have a power to maintain the seal, the witch did. So by making a clone she can efficiently make a.... Whtvr. Offsprings that have both genes, strongest men and witch.
Strongest melee fighter is still a strongest.
Just my wild theory.