20:5.4
During the course of the long history of an inhabited planet, many dispensational adjudications will take place, and more than one magisterial mission may occur, but ordinarily only once will a bestowal Son serve on the sphere. It is only required that each inhabited world have one bestowal Son come to live the full mortal life from birth to death. Sooner or later, regardless of spiritual status, every mortal-inhabited world is destined to become host to a Magisterial Son on a bestowal mission except the one planet in each local universe whereon a Creator Son elects to make his mortal bestowal.