Agree that this is a slip up on the part of the New Boy in the Writing Dept.
This GB only bring out the New Light when they are "forced" to make a change because the "Old Light" has burnt out, ie, the OverLapping Generations -- the old "this generation will not pass away" had burnt out. That generation was dead. They HAD passed away.
Wednesday afternoon GB Meeting: "Oh shit, Sherlock! We better conjure up some new razzle dazzle spin on this!"
TA DA! OVERLAPPING GENERATIONS! It was so obvious! How did we miss it before?
Let us praise the infinite wisdom of the GODs (Guardians Of Doctrine)!