Pete,
I think you are correct. I believe injuries will occur when the driver is able to move around inside the restraint system. The seat in my car fits me like a glove and wraps around me. Maybe its overkill but that is the way I like things!!
SS/GN,
The damage to the car on your link looks very similar to the crash my friend Bob Makley went through. The majority of Bob's injuries were caused by the steering column being forced up into his face. He didn't have a full face helmet and it caused a big problem. I included a dash bar in my roll cage to secure the steering column to keep the column from moving in on the driver. At the time I was using an open face helmet too. I upgraded the helmet to a Bell full face.......and with the new SNELL ratings need to buy another new one for next year..........hmmm, maybe we need a new thread about the new helmet ratings!!