For B. B. Warfield's view of Paul's predictions about the "Coming of the Lord", "Man of Sin", "Restraining Power", and "Restrainer" -- read pages 30-44 of his article on "The Prophecies of Paul:1 and 2 Thessalonians" (here)
The salient points of the article are summarized in a power point slide show (here).
If you want the bottom line only, here it is. For comparison I have inserted Gary DeMar's views from his book "Last Days Madness".
Man of Sin: Single emperor or line of emperors? Probably the latter.
(While a political man of sin is plausible, a better fit is a religious man of sin, ie., Jewish religious leaders led by the high priest – DeMar)
Restraining Power: appears to be the Jewish state.
(Roman civil government – DeMar)
The Restrainer: possibly James of Jerusalem
(possibly King Agrippa – DeMar)
The Apostasy: obviously the great apostasy of the Jews.
(DeMar agrees with Warfield on the Apostasy.)
Rev. Joe Morecraft's sermon on 2 Thessalonians 2 is connected with Warfield's views and is helpful. (here)