 Of his fellow crew members, who does David seem to have the most concern for and why?
Everything lay in readiness, fastened down star charts, instruments, glittering equipment. It waited for human hands to make it operate. The ports on the side were shielded and I stared out at static energy, hung motionless in a world of searing light. What speeds and perhaps, what distance? Four people in all, depending on a blind helpless fool who didn't know their names or the reason for that dependence. They both ended in the lead shield that was set where the swell of the curve was biggest. It meant the engine or engines took up half the ship, cut off from the forward half by the instrument studded shield. "No gravity," he grunted and sat back.
 Karen, because she's a female crew member and because she has a bad reaction to being awoken.
 Karen, because she's a female crew member and because she has a bad reaction to being awoken.  John, because he relies on him to be his right-hand man.  John, because David first wakes him up with the apparatus and is unsure how safe the apparatus is to operate.  Karen, because she's his wife and he only remembers this with time.