Michael A Martin's Romulan War novel described the Daedalus class as being a precursor to the NX series, this is rather an odd suggestion and conflicts with canon. Another thing that makes me wonder is that he described as per Spock's words from TOS Balance of Terror that the ships used were primitive and less advanced. Some people who have read the book suggest the ships that followed the NX series like the Constitution class were less advanced, however is that what Michael is saying or was he saying that between NX and Kirk's era the ships were inferior but became more technologically superior by the Constitution?