That whole stupid Aniki arc "theme" is what is preventing the author from making best goat bro join the team and you can't prove me wrong.
And I would dare to say that retconning to make it seem like Miyabi is "actually a cool and reasonable guy" in the eyes of the vampires is a bit of a contradiction if the early parts of the manga are anything to go by.
Sounds like the author remembered "oh wait, I forgot about the 'I hAvE tO kiLL aNiKi CuZ vAmPiRe BaD!!!1!' I introduced RIGHT AFTER establishing that Vampires of Higanjima used to live in erotic harmony with the humans way back then... better not create two stupid plot points that preach the respective opposites and just stick with the latest one established not to make Aniki's second death any more unnecessary... let's go with 'OH MIYABI-SAMA, WHAT A GUY!' for Goat-kun to fight to death with Akira-menai"