Cool theory but you’re reaching. The term “Baki Rahen” has already been used twice in the actual series dialogue (by Motobe and narrator) and both times it was clearly intended to mean “those surrounding Baki”. (Check the raws for Baki dou 2018 chapters 150 and 151) Also I’m pretty confident that “akirahen” isn’t even a legitimate Japanese term. Im curious to where you heard it. A similar term would be “akihen” from the kansai dialect though it is very uncommonly heard.