Finkelstein:
The leader(s) of the IBSA in 1919 proclaimed that Jehovah had selectively chosen them or him as it were by J. Rutherford, they also self identified themselves as the anointed class the Faithful Slave.
But that's not what actually happened. The claim that they were 'chosen' in 1919 was invented much later.
I've dealt with this more here in my review of Pure Worship—Restored at Last, in response to the 'Teaching Box' that attempts to defend their 'selection' of 1919.