What ONW adds to the story isn't immediately obvious just from listening, but it's Gabriel and Faythe promising to raise young Xander and build a better future, in memory of both his parents.
Another point I keep thinking of: The Road to Revolution, in concept, reminds me in some ways of the Tonight Quintet from West Side Story. Sudden scene changes with the different characters looking ahead in anticipation of the pivotal events to come later that night. Then at the end, everyone comes together (albeit still in their separate locations) to sing the closing lines.