Ya, no we aren't. What you are suggesting misses one giant hole your logic, and that is, what car is it choosing from?
If the glitch were stealing a file from a Sophy supported car, then every glitch car would work like that other (mystery) car. Ergo, every car would work flawlessly. Also, it doesn't explain why Sophy cars are supported on one track, but not others. Especially, the new Power Pack cars, since they have a Sophy file.
The only answer is that it is car + track.
Use the glitch with the Unimog at Catalunya. The Unimog get's confused and drives straight through La Caxia (turn 10). Why there? Well, one possibility is that the game uses the new configuration, but the track is modelled accurately where the old configuration is still in place and there's no collision wall to stop you following the old track. Once it hits the cones though, the collision seems to make it realize that it has gone the wrong way, which is somewhat interesting to watch.
Everything else I have tested works fine.
So, it would appear, the is no "knowledge" of Catalunya for the Unimog (where to stop, where to go, where to turn). It if were stealing a file from another car, it should overshoot every corner, but it only overshoots that one.
I WISH they would just adopt a single default file, then every car would work with Sophy.
I don’t know if your point invalidates the other. I didn’t perceive any holes, let alone giant ones…the “mystery car” it would source its logic from would be the one you saved to the custom grid slot, not some all-purpose shadow car.
Applying your ‘car-circuit’ idea, I could be convinced it was “the car I saved to the slot as trained for that other circuit it was allowed at.” Either that, or “the car I’m driving as trained for the other circuit,” though they’re most often the same thing.
Unimog overshooting turn 10 at Catalunya is a cool and interesting datapoint! I’m sure your tests cover “other sophy-glitched cars not usually allowed at Catalunya,” right? Interesting they don’t all follow this pattern…
I’d suspect your tests all used the same Catalunya-disallowed “car I saved to the grid at the other circuit,” right? Wonder if that has any bearing on the outcome...
Lastly, can we think of another section of a Sophy-eligible circuit that has its track limits defined by “cones over normal-seeming racetrack?” (Brands Hatch t4/5? I’m sure we can do better) I’d love to (have someone else) test more of THAT concept…
It may be that each car has its own baseline ability to follow tarmac and stay within walls, grass, kerbs, find the racing line, etc., and PD need give it a second file to remind it of a given layout’s nuances, lacking which invalidates it for standard Sophy use.
So that general base file could be per car, or possibly even a single file for all cars, since I’ve now split the concept into two file layers. Which brings me back to the all-purpose mystery shadow car, that can keep four wheels within walls, grass, kerbs, find the racing line, etc.

Maybe it IS real!
My point, aside from the above “…” trail-off calls for our threadmembers’ collective further testing, is to
be light, suggest that we all know nothing, remind us we’re all on the same team, and call for more testing and discussion about things we notice and behaviors we create within Custom Race.
“The only answer is…” (LOL)
I don’t know
