Ultimate Reality, I see the point you are making now, thanks. But I think you are reading too much into it. The terms "slave class", "slave" and "faithful and discreet slave" are hardly conflicting terms. I think they Society here intends these expressions t mean the same thing but they have just said it slightly differently, probably just to not sound too repetitive.
But there is no question that the reality is that the GB and it's committees and the Watchtower Society generally is really the entity doing all the teaching, if teaching is what the Society means by "feeding". In that sense, I agree with you that it makes a lot more sense for them to doctrinally split the GB/Watchtower off from the "domestics" since that is exactly what happens in practice. Maybe they will bring out some "new light" soon along those lines, especially if the number of partakers keeps escalating so much. I just don't see any real hint of that in this February 15 article.