I'm not sure what's going on with Grimjaw actually, I'm a few weeks behind on the manga but he hasn't turned up so far
The Zanpaktou section and all the other sections where it breaks away from the main story is filler, it has nothing to do with the main story and is only there to let the manga get ahead. The movies are seperate as well
The current Hueco Mondo arc looks set to finish soonish but I don't think they'll last as long as One Piece
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