Wouldn't that also be the problem if evolution happened. Or is it now part of the theory that multiple organisms mutated over time into the same animal. So not only did Mankind come from random selection, but the same selection had to happen to multiple species at the exact same time, or the first pair would have been the "adam and eve" and had the same problem.
That’s not how it works. It’s an accumulation of mutations that lead to new features, over several individuals.
It’s not like two parents will produce a mutated offspring with a larger brain or so. It’s gradual favouring of mutations that lead to slightly higher intelligence (say), that accumulate through natural selection, over several generations, that lead to the changes.