It depends how do you define FDS...at the beggining of the WT it was Russell, and half of Joe's president era BS believed that still it was Russell. Then Joe started to be infleuenced by the booze and he really got agry because all BS credit Russell for the FDS. So he tried to change this view and he managed to discredit Russell. During the last half of his domination managed to wipe out Russell's "theology" and changed WT the way it looks today. He didn't actually said that he was the FDS but if anyone that dared to question him, or the teachings that the "angels"gave him, was spiritually eliminated by Booze Jo...
So techinically speaking the idea of the FDS that exist today it was introduced in the mid 70's. So for at least 70 years there was NO FDS the way that WT explains it today.
As for the topic no matter who was wearing the "shoes" of the FDS, ALL FAILED TO FORETOLD A SINGLE EVENT CORRECT.
JustHuman14 formely known justhuman