To be honest, looking at that picture and Google Earth (especially at the four gates in question), I can only conclude there is no unique "correct real world position" for a jetway. If anything, in their static position, jetways are normally moved away from the parking position and centerline. But jetways aren't static, they move and have different dynamics based on which aircraft they're attached to. I don't think it ruins the realism if you swing these four a couple of inches/feat away from the centerlines in their static/non-attached state.