Yes, I think it is a significant factor that at the time of the murder GBC had no idea how things would unfold afterwards: police immediately on the alert, huge search party organised, thorough forensic investigations, intense public interest, need for legal representation that morning, huge media involvement, his own psychological and physical reactions, the grief of his children played out in front of him, the reality of his wife's absence, the police interest in TM, the impact on his business, the social impact of his community's suspicions about him, the tension of possible imminent arrest, the relatively speedy finding of the body, the need to go through the motions of the funeral, and the demands of playing the role of the grieving widower ... the list goes on.
In my opinion, at the time of the murder, GBC had no inkling of what really lay ahead. He truly thought that it would be one of those murders which somehow pass by almost unnoticed and take up no more than a small space in the local paper - "Wife of prominent businessman and model citizen missing feared abducted" ... and then no more ...