RX480 LED controlling with Trixx won't help you in this case. (The order Trixx shows you isn't the order Claymore sees)
Why it needs to find out a link between Trixx and Claymore?
Whatewer, just use -d option to enable only one gpu at once, step by step - and you find it by gpu load, clocks and temps (GPU-Z, MSI AB, Trixx)