It's pretty clear that Bonsegna thinks they targeted Knox from the earliest strand of investigative activity. Nevertheless, it doesn't really matter. The moment Profazio calls Mignini at 11:30 pm to report that Raffaelle has dumped Amanda's alibi is early enough. After all, who rousts the prosecutor from his bed to talk about a witness interrogation and who talks about witnesses' alibis? Donnino is also called for the same reason. It's all before Knox says anything they use against her.
The nuts at .nut simply cannot get the truth into their heads about 1:45. They think because Gemelli said it could be used for callunia, that's ok then - that Knox only had procedural rights after 1:45. It doesn't mean that at all. It means that her rights attached BEFORE she signed the statement (if she had no rights at this time, then 1:45 could be used for the murder) and Gemelli, recognising one part of the truth of this matter, somehow (and it is a mystery to me how exactly) reasoned that some use could be made of it - for criminal conviction purposes in the callunia case. It's crazy reasoning defying the whole notion of rights.
Bonsegna pushes the time back further to before Knox said anything of interest at all and goes to town on constitutional rights, manipulation, Donnino and the whole police narrative. He guts implicitly, the callunia verdicts of Massei and Hellmann, citing Hellmann's own reasoning, which Diocletus was the first to identify as a core argument in the case against Italy and hands Ficcara, napoleoni, Donnino and the rest, their arses (asses). But, notice, if you will, the gentle, nuanced handling of Mignini's role in the report. Bonsegna has acted bravely and intelligently, but we must never forget that all these judges and prosecutors in Italy are members of the same club. The tide has turned somewhat since Hellmann, in acquitting for murder was blackballed by the club, but Bonsegna will have known he must show some restraint as far as Mignini is concerned.