It is common practice that one theory be transposed on another to look for earmarks of compatibility. This has been done with nearly every scientific theory known to man..And theories change, they're supposed to...This is the biggest complaint people have about science, that it changes. Well, that's what we call progress.

Second, everyone knows Piltdown man was a hoax. And it wasn't to advance Evolutionary science, but to fill the pockets of ambitious men who weren't even credible scientists when you look into their personal histories.
It had nothing to do with covering anything up. Piltdown was about money and fame pure and simple.