i also have a theory that moore 2013 was like the el reno 2013 situation but for a longer period , you might of seen on the damage tool kit the center line extends way further , however the outline isn't there, i have herd that they had a hard time deciding what to classified that spot as it seems the tornadic wind speed did not extend to the cloud , however was clearly spinning like a gustnado / landspout thingy for over 8 minutes.
this was all done before the whole ground up theory came , this starting point would of been possibly surveyed differently if they had known this.
ironicly i think the backwards thing you explain was seen a few days ago , i remember watching reeds live video of him intercepting a strange tornado that started out fully mesocyclonic, but then slowly look less and less mesocylonic and became landspout ish, then it became gustnado ish and moved quickly.
Edit ( here is a image about the moore start path showing the uncertainty of what was going on there).
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