The climbers left the Tilly Jane warming hut, at 7,000', early Friday morning, the 8th, to climb the mountain. The accident must have happened either late Friday, or early Saturday.
Remember, when Kelly James phoned his son Sunday afternoon, he was already weak, and somewhat delirious. He did say that Hall and Cooke had left him, to seek help, the day before (Saturday). To think that he moved himself a day, or two, later, while injured, even weaker, and delirious, isn't very realistic, despite the alleged change in cell phone location that was detected by equipment that can only approximate a cell phone location..
The last ping from his cell phone was at 1:51AM, Tuesday, the 12th.
I think Hall and Cooke will probably be located well below Kelly James's location. They left to head down the mountain on Saturday, and no doubt were battling very poor conditions.