The old .uti files should work too. This update was essentially 100% models and textures, but I wanted to release it as a fresh mod with new screenshots and everything.
That, I guarantee you, is a BOSSR glitch. That NPC is Akarikon Sin from that mod. He uses Gendar's head and has a Dark Side transition to appear as Akarikon. If the Gendar NPC was set to Dark Side he'd appear as Akarikon, as you witnessed with the Stalker. His Body would be a value higher than 1. Let's say Akarikon wears a piece of clothing set to 2 because his body texture is 2. In this case, the Stalkers armour is set to 1 which is Darth Bandon's texture.