User blog comment:BannedLagiacrus/Discussion of the Week: Elder Dragon-Level Monsters/@comment-25119729-20160328122058/@comment-16331478-20160331114443

Nah Raging Brachy is a variant. Pretty sure rare species only count if there is a subspecies first. Also it doesn't get a unique game in-game, the quest just says Brachydios, much like all the other vairants.