Then, man was monkeyed with. By whom? My answer is: the Elohim, the Celestials.
Too many ways in which man differs even from the closest animals, in ways that could not possibly be pro-survival or naturally selected, even if there were the zillions of years of time between H.erectus and us that there are NOT!
The very OOA theory itself says that in effect the whole thing leaped from Erectus to As Good As Yo Mama in about the period from 300,000 to 100,000 yrs ago.