My understanding of this come from "A PEOPLE FOR HIS NAME" by Tony Wills.
CTR wasn't preaching to the soon-to-be-dead. He felt his mission was to gather together the Bride of Christ who were scattered throughout the churches of Christendom.
"A PEOPLE FOR HIS NAME" is one of the best histories of the WTB&TS you can get, which is why it isn't a Watchtower publication. You can get a copy from FREEMINDS or from LULU.com.