@wraithtdk: I would still put a note on Batman 616 to alert readers that the story exists elsewhere. No link. Just the brief info.
The notation was a good idea, but I'm not sure it's strongly tied enough to to Batman #616 - Hush Chapter Nine: The Assasins or Batman #617 - Hush Chapter Ten : The Grave, so I compromised. I made an entry in the Hush story arc page, listing Wizard: The Comics Magazine #0 - Wizard Zero under the "related items" section, with a notation about the story, which was indeed set during said story arc.