Each step of the process requires groups to pass on instructions to the next person who needs it.
We've already established that there are 30 of them and 1 of me, so resources are limited. So it teaches them that the fastest way to get help is NOT ME.
So they start to rely on each other, and they stop seeing me as having all the answers.
I also started using ClassDojo to help the groups bond. There are lots of chances for students to earn some Dojo points, such as figuring out the reading logs using just by website, or subscribing to my Google Calendar, or even just returning their MinecraftEDU permission slips.
Having the entire group finish the task means more Dojo points. The little bit of added motivation pushes them support struggling classmates. It's a win-win.
Neither one of these tips is earth-shattering. But they are the start of a year-long process that builds community.