depend on their unique traits. if one of these species evolve a new complex trait (such as new organ) then it will be evidence for evolution.
This isn't my subject, but as far as I know, every bone, muscle or nerve in the human body has its analogue in the bodies of the other apes. There are no 'unique traits', so the evolution of humans from non-human apes, or of one non-human ape into another, doesn't require the evolution of any 'new complex trait'.
What do you mean by a species of apes evolving a new organ? As far as I know, all the apes, if not all the primates, have the same major organs, e.g. brain, eyes, ears, nose, tongue, lungs, heart and blood vessels, teeth, stomach, intestines, liver, pancreas, kidneys, urogenital system,
etc. There would be no need for any species or genus of ape to evolve a new major organ for it to change into another species or genus.
Exactly what are you saying? Are you saying that if the individual species of apes do not have any unique traits, and if they have all their major organs in common, they all belong to the same kind, and that therefore the transmutation of, for example,
Dryopithecus into
Pan (chimpanzee) is not really evolution? I await your answer with interest.