Quotations from Stephen's article will be in bold.
In Acts 28:16, Paul is recounting to King Agrippa what Christ said to him when he first appeared to him. By this time, nearly thirty years had transpired since this event. This is more than enough time for Christ to have made known everything he promised to make known to Paul when he first appeared to him and commissioned him as the Apostle to the nations. And even if Christ continued to reveal new things to Paul after he was imprisoned, there's no good reason to understand any subsequent revelation as involving an administration distinct from that which was given to Paul before his imprisonment.
Although we read in Acts of Paul heralding the truth concerning Christ to unbelieving Israelites on several occasions, bringing the gospel to Israelites and to the God-fearing Gentile proselytes who blessed Israel and attended the synagogues was simply not the primary reason for which Paul was made an apostle. Nonetheless, Paul had a deep love in his heart for his "relatives according to the flesh" (see Romans 9:1-5; 10:1; 11:13-15), and it was undoubtedly this love that made it necessary for Paul, the apostle of the nations, to attempt to persuade some of his Jewish brethren of the "trans-administrational" truth concerning Jesus Christ.
In connection with this point, it was the spiritual gifts possessed by the apostles that enabled the Scriptures to be both written and identified by believers at this time (1 Cor. 14:37). The closer we get to Paul's completion of the inspired canon of Scripture (which took place during his imprisonment), the less miraculous activity we find taking place (2 Tim 4:20). But even in 1 Timothy we still read of the "laying on of hands" (1 Tim 5:22; cf. Acts 19:4-6; 2 Tim 1:6-7). Once all Scripture was complete and the canon was established, there was no more need for further supernatural manifestations of the spirit. Paul knew that the miraculous gifts would not last among the body of Christ and, as early as his epistle to the Corinthians, began immediately preparing the body of Christ for the time when they would vanish (1 Cor. 13:8). Only faith, hope and love were going to remain. Remain among whom? The body of Christ, of course. Contrary to the claims of some Acts 28:28 dispensationalists, the body of Christ referred to in this epistle did not vanish when the supernatural gifts did. It simply attained to a greater level of maturity. Certain gifts disappeared, but the body of Christ itself continued.
The Snatching Away: For the Body of Christ, or Not?
I think a more reasonable interpretation is simply that, because Paul and those to whom he wrote were obviously alive at the time he was writing, he includes himself and other living believers as being in, and representative of, that particular category of believers that he has in view (i.e., those believers who will be alive and surviving when the snatching away takes place). I don't think Paul expected to necessarily be in that category of believers who are "alive and surviving" when Christ comes to remove the body of Christ from the earth before the coming "day of the Lord." As far as Paul knew at this time, it could've been the Lord's will that he (as well as those to whom he wrote) be martyred prior to this event, and would thus be among the "dead in Christ" at the time.