The AK10 does work with older iDevices running iOS 7 with the CCK and the supplied USB cable. I have tried iPhone 4S, iPad2 and they all work fine. But you have to first turn on the power to the AK10 before connecting otherwise the device might complain and strange things can happen. I have run into an issue with the iPad2 that it froze and wouldn't respond to anything anymore. I have to wait until it shuts down itself and reboot. I guess that's why older devices with the old 30-pin connector isn't officially supported by the AK10.
If your iPad is the one with the Lightning connector, there is no reason to use a CCK. I have tried the iPod Touch 5G and the iPad mini w/Retina and both work without any problems with the supplied Lightning cable. All the iPads also aren't listed as officially supported, but I guess A&K just don't bother to list them on their site since they market it as hifi for your smart phones. Otherwise I see nothing why the iPod Touch 5G would behave any differently than the iPad mini.