Those versions of the Vonbotts were rigged with custom rigify.
You use a meta rig to show where you want the bones to be, and what you want them to be (eg – arm or a leg etc)
Then you generate the rig. The ‘ORG’ prefix is the original bones from that meta rig.
In regards to the other issues you are having – Rigfy has the IK and FK backwards to what I would consider ‘normal’.
Just slide it to the side that says FK. (which is to the right in Rigify)
And could you show a video of the heel issue. Just make sure you are only rotating it on the X axis. The other axes will bank the foot (maybe that is what you are doing by accident?)
Adrain:
I forgot to mention autobohdi is using the newest version of the Vonnbot rigs from the upcoming yet to be released animation bootcamp course.
He and another member are rig testing for me.