There are so many ways you can look at this, and there may never be a convincing answer.
You could even say for example that the Shippō pattern itself developed from people looking at the stars, and maybe seeing random patterns. In Japan of course they would not have seen the same Mediterranean mythical figures or creature shapes up there, though you do find allusions to the Hokuto shichisei 北斗七星
One of my netsuke could be a star map, but that is only one interpretation of it and other possibilities remain. I do not feel the need to come down on one side or another.
My own feeling is that we are free to look at Shippō patterns and make mental associations, and that such poetic lateral association or subtle allusion is an active feature of Japanese art.