So I managed to open the kegs Sanke connector. I simply grabbed the connector and twisted counter-clockwise.
Pull the spear out
Coupler and spear removed
Sanke connector on keg top with spear and coupler removed:
A shot with the camera pointed straight into the keg... you can see the bottom of the interior (yes that's the beer that was left behind):
It should also be noted that I have almost gotten the entire sanke connector disassembled. One more piece and the ball valve is free.
Now to size for a bung and clean this bad boy. It's my understanding it's 13.7 Gal U.S. So with 1 gallons of beer in it, I'll need a hoist to lift it.... I don't want to ruin my back....