I don't believe him, Jixy.
I certainly believe VT is guilty of one thing, and that is lying in court (which, you may argue, is a crime in itself). I don't believe he was trying to implicate CJ. I think he (and his girlfriend) were merely trying to help the police by offering extra information (which the police had invited all the neighbours to do).
Tanja was part of this too----some accounts actually say she telephoned the police, rather than VT. What do you make of that? Surely, you dont think she was guilty of anything?
CJ has never said (as far as I know) that his car wasn't moved. Even if it was, it does not implicate him. He might have turned it round to make it easier for him to drive out the next day, or perhaps somebody (innocently) borrowed his car. We don't know. He wasn't called as a witness, so we never heard.
It could be argued that CJ himself "implicated" people by saying that he thought he saw two people with someone who might have been Joanna. After all, if VT committed the crime, CJ could not have seen her with two people, could he?
There are too many "dont knows" in this case, which is why I have doubts. And, of course, you might be right, and I might be wrong.
Have a good look around all the old forums, etc. Nine and I are not the only two people in the world who have these doubts!