Honestly, no one is quite sure. Could possibly be a bug/oversight, but with all the threads they should have noticed by now. If it was done purposely, it seems kinda odd as well. Most people think the older models look much better. Best we can do is let Bioware see that having the sabers all be drastically different not only looks awkward and unlike the SW movies, but also mabye dual wielding certain colors look totally out of place.