Very likely an ibex. This is because the feline was probably used for Cancer in Palaeolithic art and Catalhoyuk shrines at least. We also find that the ibex was used only either for Gemini or Aquarius in all the places we have looked, from GT through to Mesopotamia and ancient Egypt. I know you think that it looks more like a feline, and you are welcome to your opinion - I can easily see it both ways. But the statistical case for Pillar 43 makes it extremely likely your are wrong. See also the fragment from GT we have discussed before. If this fragment also represents the date of the YD event, then the 'long-legged' quadruped on this fragment probably represents Gemini, and these legs are clearly not those of a feline. So there is even corroborating evidence at GT that Gemini is represented by an ibex, not a feline.