Bailey covered why the decision to continue beyond 31st Oct was the point where they made a decision which was against both the public interest (cost implications) & the complainants interests (they could reset the process & investigation at that point too).
that's Bailey's view, which to be fair, is hardly an unbiased non politically motivated assessment.
yes, on October 31st that is when the two options (disclosure re McKinnon etc/reset) were put on the table, discussion then followed for a period through November. It was the December (6th i think) letter that advised they no longer had a 'stateable case'. If they'd ploughed on regardless beyond this then I would agree they would have went against legal advise. But they didn't
It wasn't just Bailey talking about this (much as she tried to make it that way). Nicola Sturgeon went into all this in depth as well. Repeatedly.