Gathercole is a very careful writer, and I appreciate how he engages with the New Perspective on Paul rather than being dismissive. Extremely helpful especially on Romans 2-3 and the 'diatribe' style of the Apostle, and exactly what distinguishes him from the outlook of his Jewish contemporaries. An excerpt:
"the point in Romans 3:21 is not that God is now revealing his righteousness to those who are 'outside the pale of the Law'; rather, Paul is talking of the revelation of the righteousness of God to all who believe, and that includes the revelation of the righteousness of God independently of the Law to the Jewish nation. Because Israel does not obey Torah, God's righteousness cannot come to them through that means".
Gathercole concludes, "in contrast to the emphasis of many scholars, Israel also receives the righteousness of God independently of the Law...The key distinction that Paul is drawing is not between those 'in the Law' who receive the message of condemnation through the Torah (3:19) and those 'outside the Law' who receive the righteousness of God (3:21). Rather, Paul is concentrating on the fact that all, Jew and Gentile alike, receive the righteousness of God 'independently of Torah,' and through faith" (emphasis original).