The point that I find significant and which the Watchtower Leadership has consistently neglected throughout its 133 year publishing history is the use of the unexpressed predicate in this parable. Very often in the Greek NT, the predicate [the verb "to be" in its various grammtical forms] is left unexpressed and is understood in the sentence. For instance, throughout the Beatitudes, the predicate has been ommited, yet the sentence, in Greek is unaffected.
"Blessed ARE the poor....Blessed ARE those who mourn...etc"
And we even find this in Matt 24, in this very parable under discussion. Verse 46 tells us "Blessed IS that slave who if his master...." If this is tenable in verse 48 as well, where the evil slave is mentioned, we then get:
"But if that servant IS evil..." [see NAB, NJB, NLT, NIV etc] which leaves us with an interesting propsition:
There are NOT two slaves, one faithful and discreet [conveniently interpreted by the Watchtower as themselves] and the other evil, [all those who oppose them] but only ONE salve. If he is faithful and dicreet he is commended, but if he is wicked, he is castigated. I think the NLT is the most explicit in this context:
"That servant will be blessed IF his master finds him doing his job when he comes. On the other hand, IF that servant IS wicked....then his master will punish him serverly" [verses 46, 48, 51]
Thus, as The Searcher has pointed out, the same servant is placed in either category, because of the two conditional clauses beginning with "If...." Whenever Matt 24:46 is fulfilled [evangelicals are debating this issue, some say it is past, in 70 AD, and others place it in the future during the Great Tribulation] those called to this responsibility can be of either class.
I think that the Watchtower Leadership, as a result of sullying its collective hand with false prophecies and pretentious arrogance, has forfeited the right to be the faithful servant and has placed itself in the position of the wicked servant fit only for punishment when the Master comes.