What a compilation!
Thank you Petra for all the long hours that must have gone into this project.
On page 5569 (Laodicean Messenger 1923) it is made clear that CTR was the only FDS for all time:
"Would it not, then, be well for us all to adjust our minds to the thought that God never intended that there should be but one servant, who at any time would be made “ruler over all His goods”; furthermore, that Charles Taze Russell filled this office from first to last; having no predecessor, and it is quite certain that no successor was intended."