My general assumption was that Heartseed's introduction is the most we'll actually get in terms of fantasy/sci fi explanations, and we probably won't see him again until the end of the show. He was just there to provide exposition on why the body switching is happening and nothing more. I personally liked it since it gave the body switching trope and added sombre element of being toyed around with which I haven't seen before. It could easily lead to an extra layer drama since the extreme lack of control they have over their situations is bound to cause more and more stress as they go along especially when they know someone's at fault but can't lash out.
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