Cambrian seems like heavens design team didnt have an established meta and were just having fun with it. Once the horse design got approved the engineering team got lazy and used it as the base for everything.
Chordata is the third-largest phylum of the animal kingdom (behind only the protostomal phyla Arthropoda and Mollusca) and is also one of the most ancient taxons.
Cambrian seems like heavens design team didnt have an established meta and were just having fun with it. Once the horse design got approved the engineering team got lazy and used it as the base for everything.
I think the technical term for animals with that horse design is Chordates
Seems legit.