Saturn on East Wall of Coral Castle - Planet Corner

Right Next to the Mars statue, Ed has carved planet Saturn. There is no doubt that it represents Saturn, because Ed has carved a ring around it, to mimic the real planet. During Ed's time, people were allowed to climb on these statues and pose for pictures, this is no longer the case now. 

Saturn weighs around 18 tons, so does Mars.  On the other side of Saturn is a large crescent, which Ed referred to as the "Crescent of the East".

Ed referred to the North East corner of Coral Castle as the "Planet Corner", yet he has carved only 2 planets: Saturn and Mars. Why?

The back side of Saturn does not have the ring. Was this a mistake Ed made, or did it fall off?   

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