The truth of the matter is, the pic of Kovu you posted does display a lot of Mau influence. What you would like to see in a Savannah compared to a Mau is smaller eyes with hooding that are flat on top instead of rounded, bigger ears, wider at the base and closer together on top of the head, a wider nose bridge with puffy nose leather, a narrower and longer face (more triangular than round) and a slimmer body with long legs.