I'm not sure I understand your question... Yes, I'm using a 1K resistor. It works fine for me. What kind of proof you are looking for? With a 1K resistor on PCL pin, TK3850 is delivering enough juice to power both wi-fi and bt modules inside my C1K. But if I connect the external usb ethernet dongle at the same time, it shuts itself off (overcurrent protection kicks in). I didn't really want to have a possibility of three usb devices powered up at the same time, so it's fine with me. Most of the time, I use either bt or wi-fi or external ethernet only.
-albertr