There's a domino effect.
In his summing up, the judge told the jury that if they found deliberate harm in any cases, they could take that into account in reaching a decision on other cases. They did not need to know how any injury or death was caused.
The jury was also told that the results of the insulin tests on babies F and L could only mean deliberate harm.
The first verdict the jury reached was on babies F and L.
This means that their guilty verdict on babies A, B, C, D, E, G, I, M, N, O and P can be considered to have depended to some extent on their verdict on babies F and L.
At the retrial, they were told that they could take the other verdicts into account re baby K.
Since that instruction re babies F and L now looks very shaky, that conviction is shaky likewise, and that undermines the rest of them.
Meanwhile, the evidence for all of the murder methods proposed has proved skewed or non existent under scrutiny since the trial. So the probability is that, after a long time, the whole thing will collapse like the house of cards it is