Having read the dead hiker's TR of the Bells and the 14ers thread on this accident, a handful of things struck me:
1) The way they talked about the Spot locator beacon, it seemed to me like they were relying on it as another tool in the pack, such as a piolet, or map & compass.
2) He had two close calls last summer, his hike of the Bells and there is mention of another incident within a couple weeks of that trip.
3) He was only 18.
4) He seemed to have been exceedingly driven to complete the list, or in the event of his death, have someone complete it for him ("hellbent" or "on a mission from God" don't seem like appropriate adjectives, given his deep faith); and his partner, no more than 18, talks about needing to complete the list before he heads off to college.
These things make me wonder if his & his partner's maturity & decision making played a role in the accident. Needing to accomplish something, as opposed to striving to, leads to accidents.
(I'm impressed with how civil that 14ers thread has remained. On most forums they'd be well into the acrimonious Monday-morning quarterbacking.)