Cottages,
I don't believe that Joran will claim Stephany was killed by others in front of him. But you never know, he is full of stories. As I noted, I believe he is innocent of wrongdoing in both this case and the Natalee Holloway disappearance, but he is an inveterate liar and that makes it even harder to defend him. That being said, I think the most likely scenario would be that she was still alive when Joran left the hotel for good.
As for anything else that has been claimed by the Peruvian authorities, remember that they also claimed Joran willingly "confessed." If it can be demonstrated that he didn't, and a false "confession" was prepared for him to sign, I think that all of their claims must be seen in a more skeptical light. We don't know what the video tape from that camera shows, except for the excerpts we've all seen numerous times. To be certain, we would have to see the uncut tape, especially from the time Joran left until the moment when a hotel worker opens the door and finds her body. If anyone is seen on that tape, leaving or entering his room during that time, then Joran is unquestionably innocent.