Yes, a rehabilitated Curatalo would the most obvious violation of what the ECtHR has said.
Another interesting issue is Knox. I seem to recall, but not sure, that she made some sort of statements in Hellmann's court. These statements could play into the callunnia and alibi issues. If Hellmann accepted Knox as credible, and used her testimony, then Nencini has a problem.
Also, if Nencini is going to use Rudy to incriminate (not sure that he would do so), then that will be a problem as well, since he's already been ruled unreliable.
It would also be interesting to have a list of all of the defense expert-testimony requests that were submitted to Nencini and denied, because I think that that will be an issue, also.