the master of that slave will come [Greek: héxei] on a day that he does not expect and in an hour that he does not know, and will punish him with the greatest severity [literally, he will cut asunder him] and will assign him his part with the hypocrites. There is where his weeping and the gnashing of his teeth will be.”​—Matthew 24:48-51; Luke 12:45, 46; INT.

It would be far opposite from the slave’s being put over all his master’s belongings. So Jesus’ suggestion here is, Suppose that the appointed slave would turn out bad and act unfaithfully and imprudently, what would happen to him when his master suddenly returned? It would be just as Jesus described.