lol the xeno stowaway theory has been around since alien 3 actually.
All gearbox had to have said was that one got onboard planted the egg(s) and went into hideing in the lower levels of the ship.Then it would change into a preatorian and go dormant,bam WY boards ship transfroms into a queen and the hive starts.
Gearbox should have payed one of us millions of dollars to write a story,instead of making the plot holes worse be letting someone who does not know what he is talking about write it.