benbret, the answer to your question is, Yes, the replacement is completely legal per Rule 10-4-6:
"ART. 6 . . . Libero serving:
a. The libero will be allowed to serve in one rotation.
b. When serving, the libero would not be required to leave the playing area or be out of the game for one rally/dead ball before replacing the incoming player in the right back position."
I know that most of the situations have had the libero rotating from LB to RB to serve, but per rule there is nothing to preclude the libero from rotating from CB to RB as in your scenario.
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Jan G. Filip - San Jose, CA
EBVOA Rules Interpreter Emeritus
NCS Volleyball Officials Coordinating Committee Recorder
CIF State Volleyball State Championships Referee (2005), Scorekeeper (2006-2007) & Libero Tracker (2010)
PAVO State Referee (2014) / PAVO Certified Scorekeeper (2014) / PAVO Certified Line Judge (2012)
USAV Junior National Referee (resigned 2013) / USAV National Scorekeeper (2014)
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