they ditch 1914, they'll have to ditch the Gentile Times prophecy, and the Last Days in general
No, the implication is that the events came to pass. A shift from the importance of date to the events. So the exact date is not important anymore because the events prove the date. However, since there is testimonial of evidence by the anointed that they experienced the sign occurring in 1914, are the going to say that they saw but they don’t know when? That is not what WT means. What they mean is that although they experienced the sign in 1914, that is all they can testify to because they cannot see Satan actually kicked out and the moment when that happened. But since there are events that substantiate the date and testimony of the sign, how are they going to say that never happened.