i *suspect* that there’s something in the cross with the lynx that makes the polydactyly; years ago a coworker spoke of an area where she grew up in Michigan (boy, I’m drawing a blank now, but it was probably 30 years ago this happened) and everyone’s cats were polydactyl. Something like that can creep in due to inbreeding and then stick around if its a dominant gene. I joked at that time that she should crossbreed the polydactyl cats with tailless Manx cats...
They’re incredibly beautiful cats, all.
I don’t think our Maine Coons had and extra toe.