Chapter Black was in the manga? Then it's not filler. (By definition, filler is a story in the anime that is not in the manga.) I was going by this post:
Quote:
Originally Posted by wingdarkness
[YuYu Hakusho] has the best filler arc too which BLEACH right now is trying to copy and has really expanded on but it's not quite as dark and artistically stylish as YuYu...
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Since Bleach just copied the Chapter Black Saga, it clearly seems to say that the Chapter Black Saga was filler.