What they drew in their heads (like most modern scientists today - what they expected to find), was wrong. Neanderthals had no spinal lumbar curve ... what this means they are in the process of learning )no info yet).
Well... at least Moshe didn’t have one. But was he representative or a fluke?
Hmmm, no lumbar curve? Fewer back aches for one thing. Probably they didn’t start out as a quadruped that adapted to standing up. There are implications of that that I do not like.