Salary decline is tough, though, because salaries drop across the board every season as it is, and like you said it's influenced by certain skills at every position which have varying degrees of importance. It's still something to keep an eye on. That 14k salary drop is ridiculous, never seen anything like it.
Yeah, it would be great to collect that data while specifying if a career extension trainer was used. We could get a picture of the rate of decline, and the worth of a career extension trainer.