Freek, do you have a friend that can take care of your cats for some time?
See, it's not that your cat doesn't like Tesla, but it's that your cat is territorial.
Since the kitten is a new being in the household, your cat feels threatened and thus attacks it.
If you introduced the cats to eachother in a different environment, they SHOULD be more warm to eachother, and after a week of socialization in the new environment, bring them back to the original environment. Together.
After this, they SHOULD no longer fight eachother.