You make a very strong argument, but if you take fischers score vs the top 8 in the interzonal and double it, fischer would've had 10/14 to nepos 9.5/14, which given it was just 1 game vs the top 8 and given the ELO spread was vastly more spread than current candidates games(easily fischer had 100+ more ELO than the other top 7 opponents) I think it's fair to say you could say nepo was more dominant when compared to the interzonal

granted it becomes more clear that fischer dominated in the quarterfinals forward, but it still is worht pointing out that his opponents weren't nearly as strong as nepo's opponents, relatively speaking

I imagine nepo's score would've been MUCH stronger if he was playing 100-200 ELO points weaker opponents all candidates. Instead nepo had 3 opponents with higher ELO and his weakest opponents ELO was only 19 points lower than his own...

in summary, I think you're correct and I was wrong, but I'm not so sure it's quite so clear-cut when you factor in other variables