Earnest: Jehovah's Witnesses do not identify these slaves with the "faithful and discreet slave" of Matthew 24:45-47, and it can be seen when reading the verses prior to vs 45 (vss 32-44) that they refer to the coming (not going) of the Son of Man.
LLTR: Who really is the faithful and discreet* slave whom his master appointed over his domestics, to give them their food at the proper time?+ 46 Happy is that slave if his master on coming finds him doing so!
A closer at on coming, signifying his return which still shows before he left, the slaves had been given a task.
So according to this watchtower....... In 1919, a time of spiritual revival, Jesus selected capable anointed brothers from among them to be the faithful and discreet slave and appointed them over his domestics.w130715
They are saying ON COMING the master the finds Russell and his cohorts as that faithful slave appointed to feed his domestics but still to be appointed over all his belongings
The problem here is ON COMING, the initial task was given when he LEAVES, when the master returns, he confirms is diligence to initial task and REWARDS the slave with appointment all over belongings just like the other illustrations