I know it might not go over well because he wasn't popular, but if they don't want to be derivative with the Zeus origin now that Diana's his daughter, they could say Cassie is Jason's. Use a New 52 spin but change the father since Lennox doesn't exist anymore.
That said it wouldn't bother me at all for both she and Diana to be Zeus's children. I just have seen it be a sticking point with some when the idea of Cass's origin has come up now.
"They can be a great people Kal-El, they wish to be. They only lack the light to show the way. For this reason above all, their capacity for good, I have sent them you. My only son." - Jor-El
Even if Diana and Cassie are daughters of Zeus, they will still have differents origins.
Wonder Woman is daughter of Amazon's queen and was raised by Amazons, while Cassie was probably raised by her mortal motherl in a normal city.
Last edited by Konja7; 10-20-2018 at 05:48 AM.