in the context of your discussion but might in fact be pertinent, nontheless:

The last i heard, in reference to the 'eve theory' is that as close as they can 'nail down' the time this single female that is the ultimate 'mother of us all' included the same time period that homo erectus supposedly became homo sapiens [though definitely earlier than homo sapiens sapiens]. If you think about it- it becomes rather mind boggling to consider that it may be possible that this 'eve' [and our 'least common denominator', so to speak] was actually a homo erectus. If that possibility doesn't 'blow your mind' i don't know what would...