jar, if the spectrum claim is true, there would ALWAYS BE close ancestors we can interbreed successfully with, which is probably why Yaro claims we can breed suceessfully with chimps.
Of course there is, with every single such species. In fact it's still the same species until the change is so great that breeding is no longer possible.
Your theory, or actually not theories but simply imaginations, have never been more than flights of fantasy.
Aslan is not a Tame Lion