idk the thing i like about the lonely is that theres no one traumatizing incident. its a slow and oppressive fear. like i dont think jon was ‘marked’ by the fifteen minutes he spent yelling 'mahtin’ in the lonely, i think he was marked by the weeks and weeks of everyone hating his ass through season 4.
Martin wasn’t the same. he was isolated, and sad, but he found comfort in the lonely the same way Lukas did, and the same way Jude did with the desolation. He was letting the lonely into himself, not being sacrificed to it.
i always saw it more that Martin was being groomed to become an avatar, and jon was gonna be his first victim.