Responses
Edwin said the only order that Christoph disobeyed was that when he was told to return with them. So, either Christoph did it, or he wasn't the one to whom Edwin ordered Lucaon's poisoning. I wouldn't be surprised if it was number two and Edwin was just trying to make it look like Christoph was responsible for both poisonings, as a way to mess with Ryan's head.
Wait wait wait, I hope Christoph isnt forgiven for any of this, he caused the death of Lucaons' parents, and after years of living in this group company still poisoned Lucaon? So what he refused to go back but he still POISONED HIM!!!