justitia - I understand that the african guy is appealing his sentence.
I'm not sure exactly what the timeline is. This article from the daily telegraph has a different timeline to the one you are suggesting. I also noted that Sollectico's testimony does not corroborate Knox's testimony about where she was that night. Also when she was initially questioned it was not as a suspect but as a witness.
But I have to admit that I haven't been following the trial closely and don't know all the arguments being put forward. Amanda Knox does seem awfully young to be put away for 26 years if there is some doubt about her part in the murder. However I can't help thinking about the young people who were imprisoned on Guantanamo bay who despite being tortured didn't implicate themselves as Amanda Knox has done.