Cats got different traits. Wouldn't associate what you would with a lion what you would with a serval or caracal, or even a cheetahStill got no clue why we need taxabi AND leonin AND cat shifters, AND cat head aardlings.
We now have four ways for people to play as a cat-like schmorp.
And, well, shifters are werebeasts-light so sort of divorced from things, and Aardlings can be anything they want, with cat as just a suggestion. You don't even need to go with the associated ones, given they mentioned "Triceratops" as an option, it'd be easy just to rejig it to Anteosaurus or the like. Or, well, Velociraptor for something that isn't a semi-obscure Permian beasty
Tabaxi and Leonin are close enough you could theoretically subspecies 'em, sure, but, they've never been presented that way and what works for one doesn't work for anotherJust having a cat beast race (with taxabi and leonin as subspecies options), and shifters would be enough.
The only time Aasimar have ever been used to display Guardinal features was in Pathfinder. Given Guardinals are specifically just, living creatures who dwell in the planes (As opposed to full on celestial entities like angels or deva), I'd argue proper presentation should make them stand-aloneIdeally I'd prefer to see aardlings become an aasimar sub-schmorp, with links to Guardinals as their celestial heritage. The player could them flavour that as traits from whatever animal they wanted, including an animal head.