I think in the case of those kittens, it is more of a case of some Savannah kittens looking more like domestic shorthairs. We are still developing our breed and the outcrosses used still have some influence on looks. So some Savannah kittens may show the effects of the Bengal, Oriental or even domestic shorthairs used in their heritage.
Also remember that spotted tabbies occur in the domestic population, ferals for example, and that all kittens tend to have larger ears that they "grow into" generally... just our Savannahs should not! All kittens are crazy and energetic too so just having an active kitten doesn't make it a Savannah. I run (along with some other great people) the Savannah breed rescue group, we are always fielding such enquiries of finding a kittten at a shelter and thinking they got the bargain of the century because the kitten is spotted and crazy playful hence it must be a Savannah right? Not...
Also remember that spotted tabbies occur in the domestic population, ferals for example, and that all kittens tend to have larger ears that they "grow into" generally... just our Savannahs should not! All kittens are crazy and energetic too so just having an active kitten doesn't make it a Savannah. I run (along with some other great people) the Savannah breed rescue group, we are always fielding such enquiries of finding a kittten at a shelter and thinking they got the bargain of the century because the kitten is spotted and crazy playful hence it must be a Savannah right? Not...