I understand the view that the Witnesses should themselves prove their beliefs as being correct.
Still, I think when you review all of their teachings that change whenever the light gets brighter, it’s a ball buster. They will say it’s ok. Since the light gets brighter and brighter the understanding can change. HOWEVER , IF YOU DISAGREED WITH THE TEACHINGS THAT YOU KNEW WERE WRONG and questioned the correctness of the belief, you were DISFELLOWSHIPPED OR DISASSOCIATED.