The skulls were totally unclassified. If we knew indeed what species those skulls were from, then they would not be unclassified. More likely than not, those skulls were also not of very certain date either. Just a set of skulls from who knows where, from who knows what date, without any supporting scientific evidence are worth nothing. That is why the experts themselves do not count them in any account of the species of man. They don't have enough information to determine just what the heck they are. Vade, has even less knowledge to make such a determination. All he is doing is throwing garbage on the wall to see if it sticks. That is proof of nothing.
They have now been classified TOP SECRET "EMBRYONIC." You will be forwarded instructions on how to degauss your head.