You have barely scratched the surface of what can be learned by studying bones. Bone morphology tells us all sorts of things about an organism. Diet, habits, does it climb or walk? does it do both? does it do one more then the other? What size was its brain? Wow the brain appears to be getting progressively larger. We also see an emergence of a structure suited to bi-pedalism, less suited to climbing and knuckle walking due to lack of locking wrist mechanisms on top of varying feet,leg,and hip structure.Seems like a progression to me. And on top of that, you have Neanderthals. Surprisingly similar DNA to ours, but different enough to label them another species. Yet on the outside they looked very human. How come god created two kinds of humans? Is this the part where you say "they were descendants of Cain!" Well thats fine and dandy, but the reality is that we couldn't have bred with Neanderthals any more then we could breed with chimps. There is your proof of a divergent, transitional species that shares a common ancestor with humans.