The ability to talk about archaic humans and suggesting that we are one species, means that you are making progress. A lot of scientists are wondering if Homo Erectus, with their smaller brain, Neanderthals and us are different versions of each other. At least talking about archaic humans takes you back 400,000 + years. Now, we share 99.7 % of our genes to begin with s there is less to define another species.
Viewing an advanced ape as your brother is not progress, it's stupidity. This is what a Neanderthal looked like:
Courtesy www.themandus.org
That's with and without the 6" ice-age fur coat. Cro Magnon (human) needles are common while nobody has ever found the first Neanderthal needle. That's because a creature with a 6" long ice-age fur coat does not NEED needles.