I personally think The Sex Pistols are excruciatingly overrated. Good band but I don't see them as this ultimate punk band.
For me, Iggy and the Stooges did more for punk, and bands like Television, Wire, and MC 5 helped expand it incredibly. Then you had bands like The Clash and The Replacements that changed what punk could be. Of course you have straight up bands like The Ramones that were just as good for the genre as The Sex Pistols were. For sure The Sex Pistols did a lot for punk, especially album and image wise, but there is a lot more to how punk started and carried on than just that band. I dunno.