Impact does not mean a higher position on Hot 100. Name every song that has reached #1 without using references. There are plenty of songs that you know that didn't go #1 (Thriller, for example).
Ultimately, I don't think BTW had much thunder to be honest. I think it is clear that BTW will be the forgotten era that people will love 10 years from now because it isn't cool and is the underdog. The era was short lived too.
Gaga herself, as in her name, always overshadows Katy...but that's different