ok.. hmm if The True Vampire Seras feats do infact become 8-B
if we follow that scaling chain
Only Straitjacket, MOG Anderson, Seras (also ig the captain since both him and Seras fought) and Walter would scale to 8-B, with Walter and Alucard Upscaling,
while Red Coat, Rip Van Winkle's Bullets, Alhambra's Cards, Luke Valentine's Weapons (Unless Luke has a Feat of him harming Alucard on his own), and Anderson would scale to the High 8-C Feat since that was Preformed by Red Coat Alucard
does this sound good?