The evil slave who says that "My master is delaying" and who beats his fellow servants (24:49), who is presented as the opposite of the faithful and wise servant, is cast off to "where there will be weeping and grinding of teeth" (24:51) and this is clearly parallel to the five "foolish" bridesmaids who are locked out of the wedding hall (25:10-12
I'm glad you brought up these parables Leolaia. I had forgoten about those examples. It reminds of a conversation that I had a while back with another ex-Witness about the whole subject of the "Slave Class"; particularly what Jesus' other parables revealed.
Even if one were to go along with the Society's assertions that the Faithful Slave is a "class", it still creates some serious issues for them. One of the characteristics of the Unfaithful Slave, and the Foolish Virgins, is that they had arbitrary expectations as to when the Lord should return. These unfaithful ones would no doubt try to set a time table for the Lord's return. I can't think of any other denomination that has fit this description more than the Watchtower Society. Not only that, but the Watchtower leaders; particularly Rutheford used such time tables to push, manipulate, and coerce their fellow Christians into accelerated activity in preaching a "New Gospel". (i.e. "Millions Now Living Will Never Die; Religion Is aSnare and a Racket, etc.)