Oh boy -- where to begin on this one? How about with their faulty historical application --
Paragraph 7 correctly indentifies that the nature of an "apostle" is one who is sent forth to proclaim the good news. Today we might more often use the term missionary. However the paragraph errs when it suggests that this missionary-like role was somehow displaced and "apostle" came to mean "office of oversight". If you look at the entire New Testament, the "office of oversight" is not exclusive to the apostles, as "overseer" is commonly used to apply to local elders.
In selecting a replacement of Judas the criteria was clear, it had to be someone who was with them from the beginning and was a witness of Jesus' resurrection together with the other apostles. Why? Because as an "apostle" such one would be "sent out" to preach the "good news" which included the message of the resurection of Jesus.
Paragraph 9 states the following, "Paul and Barnabas, under the direction of holy spirit, were sent out as missionaries by the Antioch congregation. They also became known as apostles, although they were not included in the original 12." This statement shows again that "apostle" was synonymous with "missionary". When Paul and Barnabas were sent out as "apostles" is wasn't to go to Jerusalem to be a member of some "Governing Body", rather it was to preach the Good News among the nations. Further Paul names other apostles in his letters outside of the 12, who were similarly invovled in this work.
The paragraph goes on to mention that Barnabas and Paul's "appointment was confirmed by the governing body in Jerusalem". This is a huge twist and though the paragraph cites the book of Galatians it makes me wonder if the writer of the article has even read it. Specifically in Galatians 1:15-17 Paul makes very clear that when he received his calling from Jesus Christ he DID NOT GO UP TO JERUSALEM TO SEE THOSE THAT WERE APOSTLES BEFORE HIM.
The first two chapters of Galatians is basically a defense of Paul's apostleship against the apparent pillars of the congregations Jerusalem (who he names as Peter, James, John ). Paul is saying that he received his calling to preach the good news to the Gentiles directly from Jesus and that Jerusalem had nothing to do with it. He further states that he returned to Jerusalem 14 YEARS AFTER he was acting as a missionary, to share with them the work he was doing among the Gentiles and to help settle a matter where those in Jerusalem were causing trouble for Gentile converts (mainly regarding circumcism). Now think about that, the so-called "governing body" in Jerusalem didn't confirm his appointment for FOURTEEN YEARS. It is laughable to suggest that they held some kind of authority or rather he was seeking their approval. Rather what actually happened was that they acknowledged the work he was doing among the Gentiles and gave him their blessing. Now this is just my feeling on the matter, but I don't doubt had the pillars of Jerusalem told Paul they disagreed with his apostolic ministry that he would have ignored them and continued on considering how he claims to have personally rebuked Peter for shunning the Gentiles in Galatians 2. Also note who Paul lists being in Jerusalem in Galatians 1 & 2. He speaks about seeing only Peter (not the other 12) and then fourteen-years later Peter, James (not one of the 12), and John, later in his final trip to Jerusalem before his arrest he deals only with James, the brother of Jesus. So you have to ask, if there was a central "Governing Body" in Jerusalem made up of the 12, where were they?
The paragraph concludes saying "shortly after that, Paul had a part in dispensing spiritual food. He wrote his first inspired letter." So here the paragraph ties "dispensing spiritual food" with writing a letter that became a book of the Bible. (Interesting enough scholars place Galatians as the first "book" Paul wrote. If so this meeting with the "pillars" of Jerusalem really made an impression.) According to the Watchtower then, dispensing "spiritual food" in the first century involved writing what later become accepted as the New Testament. Think about this, if the Watchtower is correct, during all of his preaching as an apostle, Paul hadn't been dispensing "spiritual food", it was only on those limited occasions when he was writing Bible books. This is important point that will be touched on in the next paragraph.
Paragraph 10 attempts to show that only a fraction of the "spirit-begotten Christians" were involved in overseeing the preaching and work and preparing spiritual food. It further points out that only eight men were used to write the 27 books of the Bible. Once again it wants to link "preparing spiritual food" intimately with writing Bible books, disregarding any other teaching and preaching work accomplished by these men. I'd also like to again point out that the primary writer of the New Testament canon was the Paul of Tarsus. As was already shown, he wasn't hanging out in Jerusalem as part of some central "governing body", but rather was a traveling missionary. In fact his "books of the Bible" consist of letters to the various congregations he had preached the good news to, as well as those who had assisted him preaching activity. So if the Watchtower were correct, the "spiritual food" being published in the 1st Century was not coming from the Governing Body in Jerusalem, but when a traveling missionary, who only visited Jersusalem on a few unique occasions.
In this we also have to ask what about the other apostles? The ones that didn't write Bible books and the ones that were inexplicably not around whenever Paul visited Jerusalem to deal with the issue of Gentile Believers? Were they not fulfilling their responsbility as a "faithful slave"? Historically, we do not know exactly what became of the 12 apostles. After the opening chapters of Acts the Bible is silent on the matter outside of Peter. Traditionally it is accepted that the remaining apostles preached the good news throughout the inhabited earth as missionaries. Some of these traditions are stronger than others, for instance is quite likely that Thomas carried the good news to India. Regardless, the notion that these twelve apostles remained in Jerusalem as a Governing Body is severely challenged.
So you read an article like this and it makes you wonder why it is being written. If I had to guess it is to shoot down the notion that any of the "anointed" outside of the central "Governing Body" have authority or obligation to provide "spiritual food". However, if you look at this strictly in a JW context, there would be more Biblical evidence for some brother outside of Bethel in the missionary field providing "spiritual food" independent of Governing Body.