I am aware of the morphological similarities. Some of those are more a function of ruggedness and size than lineal descent. If you look, males tend to have more of those traits than females.
I think though that the recent DNA evidence is more convincing than morphology. It suggests that there was no close relationship of modern humans with Neanderthal, and that the split was some 350-400,000 years back.
Have they compared Neanderthal with co-existing H. sap? Also H. sap then vs now?
I expect we'll have convincing evidence before we die. (At least, you)