Dead(?) Engineer in stasis

In this shot from the Featurette (iTunes), the sarcophagus/Engineer stasis module is translucent and there is clearly a body still in there. The translucent covering has been exploded from the inside. This implies that a 1979 xeno (or similar) was born from this individual. I assume that this means that the Prometheus crew can likely see that one of them (without a hole) is either in there still or that it is empty and infer that there may be a 4th "somewhere else on the premises.” This seems quite important to me. [img]http://masempul.org/wp-content/uploads/2012/04/still-in-there.jpg[/img] Do you think that this translucence has been intentionally obscured in post-production in the other trailers, and that this was an oversight (including this shot in the featurette)? Or, is the lighting just very different in all the rest of the shots. Keep in mind that this is just the actors moving around on set during down time. The cameras don't appear to be rolling. PS: David is kind of cute in the oversized chair.