I'm a big fan of Ryan's analysis there and the potential point of failure is exactly what I have been imagining in a physical restraint failure explanation.
That being said, after doing some digging, I don't think the restraint is fully open in the on-ride photo. Compare the on-ride photo to a photo of the restraint in the full-open position in the station:
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The perspective shift makes it difficult to really say one way or the other conclusively, but I'm definitely falling on the side of the restraint only being partially open right now.
A restraint tube failure could result in a half-up restraint just like this as the restraint bar would only be cracked/bent far enough to allow the rider's body to be forced out of the vehicle. Really uncomfortable observation re: the on-ride photo: If the restraint was cracked and the restraint tube was bending under force rather than the restraint releasing entirely, the resulting friction could also explain the pants situation of the deceased rider.
If the restraint is still partially closed in the on-ride photo, I think it makes figuring out whether or not Goliath had restraint position sensors pretty important. The restraint is clearly, visibly not far down enough for anyone to safely ride in that seat, BUT if Six Flags Over Georgia didn't have restraint position sensors on Goliath, it is honestly well within the realm of possibility in my mind that the incompetent operations at that park specifically could have dispatched a train in that state. I've personally seen multiple instances at that park of people's restraints failing to be checked at all.
It would obviously be absolutely egregious conduct by SFOG if the coaster was dispatched as shown in the photo... but it wouldn't be the first time and, just statistically speaking, that may be far more likely than the alternative?
I didn't want to consider the implications of a restraint device fracturing as Ryan described, but having said that and after watching Ryan's video, it seems to be the plausible scenario. If that is the case, SFOG's yearly NDT and maintenance is going to come into question majorly in this.
Pertaining to Ryan's video, im glad someone finally used both mechanical drawings showing the redundancy of B&M restraints and pictures showing how the restraints are linked. Unfortunately, Ryan's video will be skipped by most i fear in favor of those screaming that Rome is burning down.