The message Christ gave at Matthew 24:36 thru Matthew 25:30 was to convey two ideas. And those two points were the only reason he told those stories. Christ was explaining that his disciples will not know the time of his return. He even said they will not expect it when it happens. That idea demolishes the false concept that Christ gave a sign in this monologue to show his followers when his return would be eminent, e.g. a sign of the last days. No such sign exists. *1 And more importantly, his second message was that a favorable consequence will come to disciples that remain faithful to him, contrasting that to the unfavorable consequence coming to unfaithful disciples. Two ideas: 1. You won’t know when I (Christ) will return, 2. and if you are not faithful you won’t receive the reward I promised you.
Christ merely used different vocations to illustrate those two points. The points of his stories were not tied to the vocation of the subjects in those stories. In his faithful and discreet slave story Christ merely used the vocation of elders in Christian congregations. The fact that he used men appointed by him that are feeding his sheep is irrelevant to the points he was making.
How do I know? For two reasons. First, because every person in those illustrations who receives a favorable reward is part of Christ’s anointed church. And Christ said he is their only teacher, men are not their teachers or leaders. Therefore Christians are not to follow men. And the second reason I’m sure of this is because Christ set that story right in the middle of other stories telling these same two messages.
When you read about the faithful slave who could become an evil slave, and what happens to him if he becomes evil, then it’s clear the message is the same. Also, note in that story the slave didn’t know when his master would return. He even thought the master was delaying. Which is the exact message in all those other stories. That story means nothing more than the two men in the field, the two women at the grinding mill, the home owner that was robbed, the 10 virgins, the 3 servants. All have the same themes. Look those scriptures up; or you can find those here: http://debatescripture.org/index.php/2020/01/22/why-you-are-not-a-real-christian-according-to-jehovahs-witnessess/
*1 Christ didn’t give a sign of any “last days.” But he did give a sign of his actual return. That sign will be seen in heaven (the sky).