Saw a in car pic of him driving the car. The seat looked to be bolted to floor. Was a good 8" away from back bar. If floor crumpled seat came loose, and with the lack of any bars on the front of the cage bad things were gonna happen. As said, if proper tech and rules were followed this might have been prevented. That may keep racers without that stuff away, but who cares? So you lose a few racers instead of an entire event, big deal.
Sounds like Jason was a nice guy. Sucks.