Right, but in terms of suggesting that the prosecution theory has changed because of speculative responses made a couple of years after the trial seems to be quite a stretch ... so in that context ... that the prosecution theory has changed, I disagree on the basis that the theory has not changed at all. The theory is that Knox was at the scene of the crime during the murder, and if the prosecutor has to speculate on what would happen if the knife DNA were to be excluded, then he can also speculate that maybe the self-incriminating statement could be included. It's all speculation, and it doesn't IMO imply that the prosecution theory has changed.
Furthermore, the guilty verdict was not based on the DNA on the knife ... that evidence was but a small piece of the complete evidence. Exclude, the knife, then look at the statements. Exclude the statements, then look at the lack of alibi. Exclude the lies and absence of alibis, then look at the staged break in. Exclude the staged break in, then look at the luminol evidence. It goes on and on ... the three convicted murderers will not suddenly become innocent because one or two pieces of evidence are reviewed during appeal.