they're 2 different skins for the same model. if you want to use both, you have to know what you're doing, enough so that you can export an illidan model, change the path to the skin on it, then import as a separate model, using the second skin, with whatever path you put the second one to. As I said before, if I have time, I'll try to replace the alternate anims in the model so that both skins work with one importable model for the sake of convenience. however, that won't be happening for a while, as I don't have time for any wc3 modding till after next weekend, and after next weekend there will be more important things to do before I get this model worked on (such as my 2 maps)