Corsair Link only sees devices plugged in to the device going to the usb header. So the fans on the radiator are plugged into the h80i I'm guessing. Once upon on time , 2 years ago, Corsair made something called a Corsair Link Cooling Kit that had 4 temp sensors, 5 PWM fan headers, and room for I think 7 other Link devices.
http://www.corsair.com/en-us/corsair-link-cooling-kit
This way made a lot more sense, but rumor has it a new and improved version is coming out soon.
Computex 2014 -
http://www.youtube.com/watch?v=Hi36Oc3xiIk