Many speculating about what happened aren't looking closely at the available info, at least as it's been reported. James called last Sunday. He was in a cave, near the summit, hurt (or "in trouble"), and his two teamates had gone for help. The weather was bad all week, with only brief and marginal weather windows. There are tracks leading UP, presumably to the summit, though top steps seem to be erased by wind/snow/ice. There are multiple axe belay holes in the snow next to the steps, suggesting at least two people ascended. Today a body was found in a second cave above the first. These were experienced climbers with minimal gear planning a light-n-fast ascent of a technical route in winter. By all appearances they did all the right things to attempt self-rescue/preservation. SO, a theory... James got hurt high on the route. They hunkered down to assess and plan a course of action. The weather crapped out, so they dug in. James was probably too hurt to move, so other two attempted to go up and over for quicker, safer descent of south side to dispatch help for James. They got hit by weather on summit or thereabouts. They got disoriented either had an accident/fall or dug in somewhere because they couldn't navigate in white out conditions. If they tried to push on in white out, they could be nearly anywhere. After a few days with no help arriving and now a dead phone, a desperate James, who was probably out of fuel, made a heroic effort to climb out but couldn't get far. He dug in again and hoped for the best.
I'm just bummed the outcome is looking so grim. These guys rocked it, and they just ran into bad luck.