MD: (7 and 10.5) IIUC, it's fine for MC_INTEGRITY frames to be sent on the channel, but it's important that the "root" MC_INTEGRITY frame is sent on the unicast channel. Otherwise, channel A could send MC_INTEGRITY for channel B and vice versa, and I believe that would not be effective against the threat model.
MD: (7 and 10.5) IIUC, it's fine for MC_INTEGRITY frames to be sent on the channel, but it's important that the "root" MC_INTEGRITY frame is sent on the unicast channel. Otherwise, channel A could send MC_INTEGRITY for channel B and vice versa, and I believe that would not be effective against the threat model.