I heard about it in the past that people were DFs for questioning teaching for they felt was unbiblical and they were accused of apostasy. Couple years back I read about former JW that dared to bring a Bible to committee that questioned his faith and was forbidden to use it for his defense. He was DF's righ there. When I lived under communist regime, we actually had read bible. We had only one copy of illegally obtained WT and we could only depend on bible for understanding the text. After the fall of communism, the bible was barely used in KH. Occationally was opened to cite a text, but much emphasis was done on the WT publication and Awake. This became the authority and people were told that they lacked direct contact with Jehovah to understand the Scriptures. Only the Slave understand the light that would be distributed to us.
I had not been in KH for almost 20 years, but I have bunch of aged relatives who are still active. Last summer I went to visit them and they had WT all over. When I from curiosity opened them, I noticed that the quality of the "Food" went down in 20 years, half of the texts did not make any sense, but also the emphasis on Biblical verses were limited. I also notices that my very elderly relatives had either forgotten or nor were familiar with common biblical themes like the Samaritan woman by the well. It was very strange.
I am not suprises that people would be DFs if they use Bible when they feel the publications are in direct contradiction with it. WT spent more time on proselyting people, how to preach and approach invididuals, and less time is spent on understanding the Scriptures. You have to read a book, go to school, than sitting in assembly to listen some nonsense that you are not prepared for, and than study WT; so very little time is done into research. If anyone studies Scriptures extensively, will understand that WT teaching is man-made often with invented theology like 1914.