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Do you also have https://github.com/Alex131089/Super-RPi/blob/master/home/pi/WiimoteConnect.sh (as you can see in the link you give) ?
Because this script is in charge of settings the leds ; actually it can works without setting the led number, but you have to know which player is each controller.
If this script don’t works, try to debug it by running it yourself in a terminal with enought privileges then ;)
The logic to get the led number is a bit tricky though (have to find the right number using informations from /sys).