So Gemma appears to be a guinea pig to see how many times one individual can be severed to avoid doing things they hate (going to the dentist, writing thank you cards, flying, etc). My guess for Cold Harbor then and why Mark is so important is that it's the endgame for avoiding pain or trauma, forgetting someone completely. Mark has been curating the room that once completed will remove any trace of Mark from Gemma's brain when she walks into it
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