JJ only defended when Kaia arrived, as soon as she had landed and the other chicks started chirping, JJ started chirping too. But Kaia didn't come to the nest anyway.
Kaia must be very confused, but I hope that her instincts of feeding the chicks are stronger.
Let's see what happens. JJ isn't used to being visited or fed by a real stork anymore..at least it seems that way. Plus Karl and Kaia are both strangers.