Rutherford got "new light" that the superior authorities of Romans 13 were Jehovah and Jesus, not the worldly governments (as taught by Christendom).
After he died, Knorr got newer light that they were the government authorities after all.
So instead of getting brighter and brighter, on this issue it was a strobe light.
I'm reminded of this statement from the May 15, 1976 Watchtower:
"It is a serious matter to represent God and Christ in one way, then find that our understanding of the major teachings and fundamental doctrines of the Scriptures was in error, and then after that, to go back to the very doctrines that, by years of study, we had thoroughly determined to be in error. Christians cannot be vacillating—‘wishy-washy’—about such fundamental teachings. What confidence can one put in the sincerity or judgment of such persons?"