User blog comment:B214/Question and Answers 2/@comment-82.178.74.96-20140201113221/@comment-1359322-20140202072739

Well Azazel's one is also a prediction only too.

Though the Sacred Gear did become one, but that is only when Saji is using the Vritra Promotion. So Saji has four Sacred Gears, which would combine into one when using the Vritra Promotion which allows Saji to use all four of his Sacred Gear in unison.