With older versions of HotRod protocol (< 2.0), it's not that simple. Infinispan < 5.2 used different algorithms ('virtual nodes') while >= 5.2 uses 'segments'. In order to keep backward compatibility of clients, the server generates topology information that fits for > 99.9% (or some similar number) keys, but this does not contain backup owners, because HotRod clients don't have any notion of that.
AFAIK in HotRod 2.0
Checkout [ISPN-3529] Add support for the segment-based CH in the HotRod protocol - JBoss Issue Tracker - I am not familiar with the new implementation enough to comment about current state.