Well you are wrong. There is a reason. Horn says he doesn't remember and Flores has to say he was mistaken on three different occassions. You can see the internal struggle he had with the quote "I wasn't inaccurate, I was mistaken" They had to do this to change the sequencing and maintain Horn's credibility. Eventually he had to accept it and bite the bullet. Not remembering doesn't mean, btw, that Horn didn't say that. How does Flores Know he was mistaken if Horn doesn't remember?
I think it's incredibly naive to believe those statements.
Your "reason" is simply an explanation of why you think there's something fishy going on.
But there's NO reason why they would lie.
As I've just explained, there's nothing to be gained. Dr. Horn's credibility didn't need maintaining, and certainly not by Det Flores. He's the Medical Examiner - on medical matters, his opinion trumps everyone else.
And so what if Flores had to say he was mistaken? If he was mistaken, that's what he would say, isn't it?