You are correct that only people added to a document using collaborate will have access to it. I have a couple of ideas.
1. Use collaborate with just groups of 3, but then ask the group to post a summary to a class discussion where it can be talked about with the entire class. This works good to keep the initial work in small groups but then open it up.
2. Use collaborate but invite everyone in the class to each document. I'm thinking you name each document like "SallySteveJessie" so everyone know which document is theirs to work on, but by adding everyone to each document they all have the ability to look and see what everyone else is doing.
Rick
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