Vixen
Penultimate Amazing
There was a couple of doctors in the jury (x 2 trials, new jurors) sceptics, just like yourself. Deliberated long and hard. That's how Criminal Law works: the jury's verdict is final. Letby's only hope is some kind of lapse in protocol or a mistrial. For example, Hindmarsh or the statistics not being properly disclosed.The reasons to look at Letby the assumptions behind those investigations, were predicated in faulty statistics.
Unfortunately for Letby, Justice Goss made sure the trial was fair. The defence, under instruction from it's client, Letby herself, declined to call the defence statistician expert. We can infer that is because it didn't support any misuse of statistics.