Is it usually the case that one of the person’s soul-mates from their same group becomes a walk-in from the light to come help a struggling person here on Earth? Thus, could it have been a prearranged agreement?

It is not usually the case that a person is rescued in this way. It is approximately half and half—newcomers and individuals from the soul collective of experience for the departing soul. And it can also be prearranged as a kind of insurance policy, so to speak, to come down and try working on a particularly difficult situation with a prior agreement by a soul-mate in the light who has worked through such difficulties and is, therefore, not encumbered and likely to resonate with the nature of the greatest obstacle as a potential rescuer to take over and help do some healing. This has been particularly the case because of the absence of effective means to heal things, especially the deep karmic roots of problems that can become a repetitive, progressively worse manifestation of great pain and suffering. With the advent of the Lightworker Healing Protocol, this is no longer the case, so this extreme step will not be needed.