Scene at the end *SPOILER*

So in the end, when John mentioned something about it wasn’t exactly how they planned it but still worked, did he mean that Amanda was suppose to be on the machine with the little boy, because considering his state, he wouldn’t be able to handle all the blood? Plus my guess is his original plan wouldve been Cecilia and the guy thinking John would be devastated watching Amanda and the little boy be put on the machine? I just wanted clarification when he said that part 🫨