I don't follow what you mean, what is "not a good argument"? I haven't followed much beyond WW in Rebirth; but, to me, they chose the name "Rebirth" for a reason. It's about going back to "classic" versions of these characters. So, while some of the details may be different, I don't see how Rucka invented this Hippolyta. At most, he reintroduced her.