Do we not agree that the (d)evolution of the conquistadors was a little rushed, scientifically speaking? I mean, what, four centuries? And now they're all barky and invisible? Wendy???

I think most everyone is in agreement on that. This interactive timeline from the Smithsonian shows how slowly evolutionary changes appear: human origins. Come on Mulder, you know there must have been aliens from outer space involved--it just stands to reason.