[Ichneumon]

Somewhere along the theoretical highway of evolution apes took a left turn and humans veered to the right.

What "left turn" do you imagine apes took?

More accurately, the lineage which eventually became humans managed to hit upon some mutation(s) which achieved an evolutionary breakthrough in brain capacity/ability.

The bridge between humans and apes continues to lenghten.

There's no evidence that the gap in mental ability "continues to lengthen". Humans today are no more intelligent than humans of several thousand years ago. Yes, we have continued to accumulate knowledge, but don't mistake culture for biology.

their inability to "evolve" is one of the missing pieces of the puzzle.

You have yet to demonstrate that they actually have any "inability to evolve". In fact, modern apes have certainly evolved beyond their ancestor species of several million years ago.

[DirtyHarryY2K]

More accurately, the lineage which eventually became humans managed to hit upon some mutation(s) which achieved an evolutionary breakthrough in brain capacity/ability.

The apes had the same environmental factors, influences they breath air drink water, The same amount of time. yet there is a mysterious cause that effected the human line. IMO there's no solid cause and effect hard evidence. missing link?