It could very well be about the ten wise virgins who had extra oil and the ten dumb virgins who ran out of oil. (Mat. Chapter Whatever : Verse Who Cares) Watchtower will compare all Jehovah's Witnesses in attendence to the ten virgins with extra oil and how the Secret Watchtower is that extra oil to keep them safe until Jesus the Groom arrives for the Wedding Feast known as Armageddon.
Think about it...