I have a direct link to the drivers. Please take note that the last time the drivers for your USB Wifi was released for Mac OS X 10.6. So they may only be 32-bit drivers and not work past Mac OS X 10.7.5.
Also the USB Profiler showing the device has nothing to do with being recognized. That's the device firmware handing over pure letters to the OS.
Using MacPro 5,1 SMBIOS will allow you to not need to edit other kexts to use the Nvidia GPU. Also from my own observations MacPro 5,1 SMBIOS is more stable for x99. You still need the drivers regardless!
As for shutdown that's fine. Amazing what happens with the right kexts!