You seem to be conflating established theory with tentative hypothesis. The rejection of hypotheses is how science works. Didn't you know that?
In any case, how would having rightly rejected hypotheses form over a century ago possibly cause us to reject what remains in the theory which wasn't rejected?
That upright walking is what is the cause of an increase in brain size, as we shall see, is not proven by the fossil record.
This change is not the first change or is it the last.
There will be three major changes, not because the fossil record shows this but because the fossil record refutes the first two theories. The final change in theory simply explains why we will not find fossil evidence for the evolution of man, or anything else for that matter. The fact of evolution has come by fiat, not evidence of fossils.
You know the fiat argument, you and Alwight use it all the time.
--Dave