Debate has raged on and off line for a generation now over the origination of the Alien's egg in Alien 3 (IMAGE 1). How did it get there? Nothing in James Cameron's Aliens 1986 shows any evidence that the egg could have managed it's way on to the Sulaco logically. It seems Alien 3, pardon the pun, 'laid an egg' when it comes to any feasible connection how it got there.
That reference concerns the Sulaco in Aliens 86, the only way an egg could have existed in the ship is if it was brought on board the dropship, along with the Alien Queen. The queen came out of the landing well gunning for Ripley and Newt and was quickly dispatched. There was no opportunity for the queen to place an egg during it's brief stint on the ship.
A myriad of theories have been thrown about only to be shot down mainly using common sense. Nothing supports the validity of the egg that just, out of the blue, now appears in the ship in order to launch the story line of Alien 3.
Finally, the solution is at hand using a reference from the original Alien 1978 Walter Hill, David Giler script. The script even explains that the Alien is inspired by marine animals.
It describes the alien creature as a primitive form of Encephalopod. Which is a fictional derivative of Cephalopod, like a squid or cuddlefish (Squid? Prometheus fans take note).
Just like a Hermit Crab, the Facehugger can carry it's egg on its back for mobility (IMAGE 2). While the intense action was taking place between the Marines and the hive of alien creatures, a number of the alien egg/facehuggers from the derelict ship were making their way to the colony compound.
They bided their time and siezed the right opportunity to stowaway on the second dropship. Using stealth, they each found a dark corner to settle in, which would endorse the odds one happen to conceal itself in the escape pod Ripley, Hicks, and Newt were in for the beginning of Alien 3.
So in actuality, it wasn't so much a remote coincidence that only one egg just so happen to pick the escape pod, there were several eggs concealed throughout the ship. The lone egg that survived is the egg that happen to pick the escape pod as it's choice of concealment.
Now after all these years of viewers stuck in xenomorph purgatory, fans can finally enjoy their Alien saga marathon without any disturbing interruptions in story cohesiveness. My gift to you, no thanks is necessary. :)