The question of who was the 'faithful and wise servant' (KJV wording) has split the WT world before. It was widely believed to be Pastor Russell for many years. After he died, the belief was put down by Rutherford and replaced with 'that servant' being all the anointed as a class, even going back through the Middle ages to include the Lollards and other groups. This identification was anathema to a lot of the Bible Students, and along with a lot of other doctrinal and organizational changes, led to the Bible Student breakaway groups.
More recently, the identity of the 'faithful and discreet slave' (NWT reading) was changed to be just the governing body after 1919. They kicked Russell to the curb.