Hi Symon,
the "-RCC" command line option was an enhancement request from me some time ago as the BR*Tools create backup control files, but they do not clean up the RMAN repository after deleting the files in file system by default (by cleanup run). In consequence this lead to issues with Oracle Data Guard.
However if you are just doing a simple crosscheck and delete expired (not obsolete) by a disk channel with EMC DataDomain - then you don't need any additional job for that as this is implemented into BR*Tools with option "-RCC". If you need to allocate some other or special channel for your RMAN maintenance with EMCDataDomain - then you need an additional job.
Regards
Stefan
P.S.: You can observe the exact RMAN behavior / commands by enabling BR_TRACE (15).