You know how in the gospels many parts are repeated, some illustrations have brief summaries and some in the other gospels had more details. W/ the faithful slave scripture in Matt 24. the WT PURPOSELY avoids ever mentioning the FULL version in Luke 12:42-48 because the full version shows beyond a doubt that it's a parable just like the bride grooms, just like the slaves given money and what they do with it, etc.
If you notice in the Luke version, The one who knows what he was to do and DID it is rewarded well. Then an evil slave, then the slave who knew what he was to do but did not do it getting punished, and then the slave who did NOT know what he was to do so even though deserving punishment will be slap on a wrist.
So the full version in Luke throws away the societies explanation!