I have discovered that the Nmap OS database has some fingerprints missing for OS versions. For example, Apple iOS versions 7.1.2 and 9.3.2 are missing. Basically my question is to do with the reason why these OS versions are missing fingerprints in the Nmap-OS-DB. Have they not yet been added/nobody has submitted a fingerprint for these OS versions? Or, are the fingerprints for such versions as iOS 9.3.2 not distinct enough from existing Apple iOS fingerprints stored within Nmap-OS-DB?
(From the analysis of Nmap fingerprints that I've executed against iOS 9.3.2 it would appear that there are enough unique fields within the fingerprint to distinguish this fingerprint from other existing fingerprints within the Nmap-OS-DB).