User blog comment:B214/Question and Answers 6/@comment-134.115.187.244-20170309154320/@comment-10330822-20170325202711

Sub-Species are basically a result of special factors being present, causing the Balance Breaker to take a unique form, while Abyss Side is the result of ultimate mastery. So, its shouldn't matter whether a BB was Sub-Species or not, they should still be able to reach Abyss Side just as much as any normal Sacred Gear.