Russ was an Attraction Mechanic with AK Engineering Services(attractions maintenance) East. His brother Ron, still works at Epcot. My condolences to the whole Roscoe family.
Primeval Whirl is a very dangerous ride to work on even on normal conditions. That is why they are re-doing the ride again. New ride braking systems, new motors and controls, new wiring. When parts are falling off the ride vehicles and track daily, it needs to be maintained better or just replaced with a safer ride.
PW is just AK's money pit, they keep trying to make it safer, spending most of the budget there, then neglecting the other attractions like Everest, Dinosaur, and Kali. Compare how many rehabs that Primeval has had to Everest and Dinosaur.