Maybe the Space Jockey and Derelict is really ancient but that doesn't mean eggs are too. What if those eggs were planted there few years b4 Alien 1. That would explain that why laser field over those eggs which Kane broke when he fell into, was still active & never ran out of power or malfunctioned or anything because it was recent not really active since ancient times. Maybe that Derelict and Space Jockey is special, so someone might come around searching for it and later decide to put all those eggs there.
Things I learned while listening to the ADF podcast interview (interview starts at 33:30)...
-ADF makes changes that he believes are for the better, for his novel adaptations. Which are then either approved or denied by the studio.
-All of the suggested changes for his Alien 3 adaptation were denied by the studio and left ADF in the position that he no longer wanted to work on the series. Until patching things up with the studio during Covenant.
-ADF made many suggested alterations for the Covenant adaptation which were mostly entirely approved by the studio.
-ADF thought the Covenant script was very good, but was a little lose on it's science and a few other things.
-ADF states that the movies are purposefully cryptic, and he respects that and allows fans to debate the details.
-The next ADF Alien novel is completed and being edited. It takes place between Prometheus and Covenant.
-When asked if ADF could tell us whether or not David and Shaw would be in this next novel between Prometheus and Covenant, titled Alien: Covenant: Origins, he declined and plainly said "I'm sorry. I can't comment. They'll come and get me."
-It was ADF's idea to have Walter check the planet Covenant crew exits. Basically any changes you see in the book, were ADF's ideas of betterment. BUT, additional scenes in the novel that weren't in the movie (neomorph interacting with xenomorph) were cut scenes that existed in the original script.
-While ADF won't talk about the alterations he made that were DENIED by the studio, he did discuss that he wanted to change the solar sail concept on the Covenant. He thought it was scientifically unsound.
The format of these AVP Galaxy Podcast tool bars are not user friendly, there is no option for extending the toolbar (as far as I can tell) for allowing users to scroll through the play duration with ease. I hope they change this.
Also, does ADF always sound this annoyed, or only when talking with Alien fans?
Pardon my botch-job on that copy/paste from my reddit comment. ;p