If it was 9-0, it still would be called “Narrow”. You know, a 9 vote margin is almost a tie.
Lying bastwards.
I think you are mistaken. "Narrow" has nothing to do with how many justices lined up on each side. It has to do with the scope of the issues decided. There have been many "narrow" cases decided 9-0. And there have been many "broad" cases decided by 5-4 - ie. the gay marriage case itself.