My gut instinct is that this guy doesn't have much of a chance to collect a dime. Sony lawyers ought to be able to squash him like a bug. I'm sure, for example, that the contestant release covers ANY injury suffered while taping, regardless of how it happened. Proving that these particular injuries were the result of this particular five-second event three years ago will be tricky too.
Also, since when does Sajak spontaneously leap into a contestant's arms without reason? Especially since he LOST the bonus puzzle? That doesn't sound like something the notoriously laid-back host would do.