It has already been established that there is only one receiver in the residence. Hutch1814 pretty much covered the whole install.
And even if there were additional receivers, you don't necessarily need a CCK for WH service, but only for a DECA connected receiver to break out the "cloud" to access the internet or maybe the rest of the ethernet home network if necessary.
Without the CCK or some other way to reach the router for DHCP address assignment, the receivers would switch to an internal 169.254.xxx.xxx APIPA address scheme for WH communication amongst themselves, but have no internet or ethernet home network access.