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Cyclical patterns of events are expected to happen. We live on Earth, where everything cycles, starting with the seasons. Sometimes we can say why cycles of events happen, sometimes we can't.
But if we can't, it would be expected to rule out natural reasons before one starts looking for serial killers on the units. Not that they can't happen, but with such outliers, one has to rule out the real reasons first.
They never invited the external observer to look at their own practices. They just said, "we did everything as before".
And then when Lucy Letby is already in jail, we find out that Dr. Jayaram has poor understanding of ventilation principles, that dr. Breary lacerated the baby's liver,