To those of you who spend a lot of time trying to understand the Bible better, including trying to figure out from the Bible who the faithful and discreet is, I recommend that you spend some time trying to find out if perhaps the Bible is not inspired by a God (any god), and if perhaps Jehovah/Yahweh God doesn't even exist. I say that because I spent a great deal of time studying the Bible in order to get a more accurate understanding of the Scriptures, while delaying extensive studying of scientific literature on evolution and while completely delaying the study of atheistic literature that promotes atheistic naturalism as a powerful truth. Had I both studied extensively the pro-evolution literature and had I studied the pro-atheism/naturalism literature much earlier in my life I would have saved a lot of time. That is because I eventually discovered that Jehovah/Yahweh God is not real.
If I am right that Jehovah/Yahweh God is not real (I am extremely confident he is not real), then there is no value (or nearly no value) in knowing whom Jesus and/or the writer of the biblical gospel book called "Matthew" meant by the term "faithful and discreet slave", other than possibly helping a person to decide if she/he should cease being a JW. Please think about that.