I'm in catch up mode, so sorry if someone else has already responded. Dr. Perper and his associates have had to put together a puzzle piece, and as he stated, the further into their examinations of organs, blood, fluids, tissues they went, the direction of their thinking changed. Normal for any complex issue, and normal for autopsies that aren't so cut and dried. When he arrived at the cause of death, that finding didn't change. It's the manner of death that has been a bit more complicated and it looks to me he's been doing a thorough job.
I don't know the first thing about being a ME, but I thought they did the autopsy, lab tests, etc. and made a determination?
Perper has maybe looked at computers, done interviews with parties that may or may not have an interest in the outcome of his reports, etc.-I am a little confused on this.