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Furinkan notes that: "Sharp-eyed readers may notice among the crowd of shinigami on page four is Ichigo Kurosaki and Uryuu Ishida from Taito Kubo's Bleach manga which was running in Shonen Jump at this time."

I uh, never knew about this. Now, this panel is clearly drawn in a different style than Rumiko does and we know her assistants are the ones who draw background characters, so this may have been an assistant having some fun. I have no clue. I've never heard Rumiko mention it at least.