[arm-allstar] Hub or no hub, that is the question

[Jeremy georges]

Folks,
For 3 private nodes, do you need a dedicated hub? Or can you just define them on one of the centralized nodes and make it a 'hybrid'  node. In other words, just define all the other nodes in the rpt.conf file on the main site and then the other sites just have the main hub site listed in their respective rpt.conf?
Or do I have to have a dedicated hub for more than 2 concurrent nodes attached?
I did not see any clear documentation on this; if there is some notes somewhere, please share that.
Thanks!
-J