I can't comment about the book, haven't read it - however -
It is unfortunate, but most apostolic identification flags are for show (among men) or for comparison (about men), while a 'good measure' of Apostolic teaching goes ignored (
John 13:35 &
Acts 2:21), manipulated (
Acts 2:38 &
1 Corinthians 15:20-30), or even opposed (Note all of
1 Corinthians 14 for consistency in acceptance and frequent exceptions &
Mat 28:19).
Even so, as alluded to above - folks who attempt to elevate the 'apostolic' teaching of the New Covenant among men, often ignore the foundational teaching of the apostolic Master.
My recommendation is to first study Matthew chapters 5-7, then study the apostolic letters, in light of the teaching of Jesus. The next step would be to then take the messages contained in the letters and then over lay them on the book of Acts, to see how the instructions were 'played out' in real life. Throughout this entire effort, check out and study each of the over seven hundred references to the Old Covenant writings, which form the foundation for all of the New Testament teaching.
Perhaps, after all of this, the study of the New Covenant writings will then take on a clearer meaning and reduce some of the religious right/wrong contests, the splitting up of the body of Christ, and the frequent spiritual oneupmanship games we are offered to participate in on so many forums.
Conclusion: Too much of our focus is on ourselves and our own justification, rather on Jesus and the justification He offers. Or, to put it another way: If we would spend more time learning what it is to be a disciple (student) of Jesus Christ than we spend learning to become a disciple of men, we would all become more complete as an apostolic people.
Just a different kind of view from an old mountain man.