Evidence of Xenos on LV-223

Ok, I know there are differing opinions about where the Xeno's eggs come from: 1) Cocooning of victims. 2) A Xeno Queen. I am of the opinion that agrees with #1, or victims of the coccooning process. In my opinion, Sir Ridley wanted nothing to do with Queen Xenos laying eggs, that was James Cameron's idea. So, if we are to assume there was an outbreak of Xenos that killed the Engineers of LV-223, then why were there no eggs from cocooned Engineers found on LV-223?