Actually, the Society does not claim that the Bible Students were on a parity with other religious groups in 1918 when Jehovah is said to have "judged" Babylon the Great. They were already in the line of "witnesses of Jehovah" supposedly in existence for millennia, made up with anointed 144,000 at the time. Thus, they were already sounding the warning about 1914 in advance unlike all other Christians. (I'm stating their official position, mind you) If you read the Revelation Climax book, you will see that the Society claims that the Bible Students were already the "two witnesses" (= the John class) of Revelation 11:3-4 who "prophesied" for 1,260 days from October 1914 to Spring 1918.
Yes, however, they always used the parable of the "wheat and the weeds" to show that up until the day of inspection all religions were on an equal footing, and at the time of inspection the wheat was revealed.
I used to read the Rev. book and wonder how to answer the questions at the Book study. In fact, I remember going through the book at least two times. I still was confused each time. It was such gobblety gook.
Now it seems they will have to deal with the confusion once again as they re-re study the book. Glad to be left out this time.