It's a real shame that you view this case as such an adversarial battle of personal one-upmanship. Your use of phrases such as "climb down" and "rigorously defended" makes that very clear. Do you view this as some sort of personal mission?
I'm interested in whether Knox and Sollecito were correctly convicted. I don't think that they were, but I have absolutely zero personal investment in that position. I have nothing to gain if the convictions get overturned at appeal, and nothing to lose if they don't. I think that a small issue that might have adversely influenced the judicial panel was the police's behaviour on 6th November. What's important to the case (as I see it) is that the police seemed to have acted improperly and unprofessionally on that day, in the way they drove round Perugia with all sirens blaring (with attendant direct quotes about how unusual that was), and in the way that De Felice conducted himself in the press conference.
Who exactly was in the police convoy is - to me - less important than the symbolism of the act itself. Dempsey wrote it one particular way, but I'm perfectly prepared to accept that she may have got it partly wrong. But incidentally, I still don't think anyone here is in a position to say that Knox, Sollecito and Lumumba weren't paraded round town personally. Remind me again how this claim can be so easily checked?
Lastly, it appears to me that some people - yourself included - are jumping hard on details such as these (which are peripheral to the case), but avoiding the far more important and pertinent discussions that are directly relevant. Is that an unfair observation?