I'm avoiding USB 3 ports and have been using the cable that came with my Moto X which is the only way I was able to get the device to show up in RSD.
My brain has stopped working. There must be something somewhere I've missed.
Fastboot and ADB working, device shows up when pinged through command window. Moto drivers installed and recent (however mfastboot or moto-fastboot has never worked, not sure if these are required or redundant)
Unlocked bootloader (via code from Motorola)
System Version: 140.44.3.ghost_row.Retail.en.US
Tmobile 4.4 stock, stock kernel.
ISSUE RESOLVED on my own conviction. Needed to search through unorganized crap to install mfastboot.