Even though Mheetu was originally 'cut' from the story. Could she still have an unknown brother we don't know about? If Nala does have a brother that possibly is somewhere else with his own pride, could he have fathered Vitani and Nuka with Zira? Which could help explain the similarities with Nala and Vitani without actually having to be 'mother and daughter'..
What do y'all think?