I'm a little puzzled. If the WTBTS was not approved by Jehovah and Christ until 1919, does that mean that they were not spirit guided until then?
If not, that would explain the countless errors in doctrine up to that time.
If, however, they were spirit guided, wouldn't that indicate that they had already been chosen?
To me, it's reminiscent of the early quiz show scandals, where contestants were given the answers ahead of time, then declared the winners.
If this has already been discussed, please direct me to the post that covers this topic.