Why didnt the Orrery hologram explain the three sarcophagi that were chest burst

We didn't see ultimately what the cobrahugger was going to do. My guess is that the cobrahugger lays an egg similarly to 'cuddles' (as it has been named). Then whatever is birthed from the corbahugger lays or creates the eggs........

i do not think that the cobrasnake can lay anything, they seemed to be normal worms who were mutated from the black goo. so i reckon they still in many means have the physics of normal worms, which do not have the capability of laying eggs. of course this is not direct science, but i do believe it was just to show what the goo can do to something as small as a worm. i think the chestbursted space jockeys were suffering the xenomorph coming out of there chest. quistion is how , they must of gone through similar settings the prometheus crew went through to create a cuddles that then sucked them in one by one. there is no other explanation. but it is all open anyway. no answer to nothing and the fans can speculate all they want. thats why i don´t like lindeloff. he did this in lost aswell.. total pain in the butt xD since we won´t know it could be even that they delibritly inpregnated themselves since they might think the xenomorph is our/their god and that we are all just pawns in the whole game of chess.....

i agree the cobra snakes wer simply mutated earth worms, also about the prometheus chest burst engineer on the floor... http://www.prometheus-movie.com/community/forums/topic/7044

I must have missed it but how did David invoke the second hologram?