LOL.  You're lucky.  You tend to ask questions when I've got a few spare 
minutes to answer. :-)

To get that to work you'd have to do some tricks with the configuration of 
buddy replication.  What you want is:

1) Node 1 always chooses node2 as buddy.
2) Node 2 chooses either 1 or 3.
3) Node 3 always chooses node2 as buddy.

#2 is simple; just include all 3 nodes in the same buddy pool.

For #1 and #3 you would probably need to create your own implementation of the 
BuddyLocator interface, one that accepts a config option identifying node2 as 
the preferred buddy.

As to whether it's worthwhile, it depends on how much load your app's usage of 
session replication puts on a buddy -- how much memory and cpu is used handling 
providing backup for a buddy.

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