So, after fiddling around with trying to get the downgrade to ICS working, then rooting, then saving it up to JB, I said screw it and tried the method used on samsungs and it works. Lovely.
All you need, is...
1) Unlocked bootloader. If you don't have this, and aren't willing to have this, leave now.
2a) epinter's CWM recovery -- http://forum.xda-developers.com/show....php?t=1973904
2b) CWM / TWRP for the XT926 developer edition
3) Chainfire's SuperSU (Donate to this guy, he does a **** ton for the android community! ) -- http://download.chainfire.eu/298/SuperSU/
The process is SIMPLE.
Follow epinter's fastboot directions for installing cwm on your XT925 or the instructions for CWM/TWRP for the xt926 (Haven't tested, only have a 925) and from there, install the SuperSU package from your SD Card. Reboot, test, done.
As of time of writing, the current and 100% functional version of SuperSU is v0.99, I can not guarantee earlier version will work, however I assume that later ones will.