Humans have many unique cognitive abilities apart from language.
There are three fundamental problems with all examples of inferring Darwinian evolution on the basis of fossil evidence.
Most alleged instances are in fact analyses of existing species that are used to defend one or another theory of how they might have originated.
To generate an adaptational package requires not piecemeal change but integrated, systematic change.
I stayed in touch with Leo sporadically over the coming years. Occasionally, he would comment on intelligent design.