Alright, I'll give you that. I apologize for not being clearer.
Most characters can combat each other with a fair chance of winning with the worst match-up being 6-4 for the most part except in Tager and Hakumen's cases. These two have even bigger problems than the rest of the cast versus the top tiers because they simply lack the tools or attributes to be able to feasibly compete with the top tiers.
I strongly feel a nerf is not needed on anyone. Yes, Nu/Arakune/Rachel are amazing but, that doesn't mean the characters under them can't beat them by being better players than them. Only when you hit the bottom tiers, such as Tager and Hakumen, do you see a real problem with their match-ups against the top tiers.
With that said, all that's really needed to balance Top vs Bottom tiers is to buff up the lower tiers to give them better tools for fighting against the top tiers.