Yes. And that's despite the fact that Evans and Bohin refused to be tied down on how long their murder methods would take, so they had enormous flexibility in speculating about when "the nurse" might have done something. Air in stomach? Evans started by telling the police it would act immediately. Then he changed his mind. Based on what? Well, he told Myers you couldn't know because you couldn't experiment on babies. So, just whatever worked for plot purposes then.
If you read news summaries of the case, you might be forgiven for thinking that the experts had argued that a certain event at a certain time had precipitated each death, and that Lucy Letby was known to have been there with an opportunity to produce that event.
When you look at the testimony, it's nothing of the sort.
Baby A - supposed to have been killed by air embolism in a tiny room in front of several people, without any disruption to the flow of the line Lucy Letby allegedly used.
Baby C - none of the nurses on duty originally testified, in sworn police statements, that she was present at key moment. One of them changed her story later, another wasn't sure, another still testified in court that she wasn't
Baby D - Lucy Letby's opportunity to inject air was, according to Evans, hours before the child died and hours before the famous air embolism rash appeared. If you ignore his blustering and follow his claims to their logical conclusion ... the air embolism just went away and came back again
Baby E - yes, if the baby died of internal trauma, the opportunity was there. But there was scant evidence for this - no weapon, no post-mortem - so Evans preferred air embolism, since the child, hours later, had a rash. Assuming the air embolism preceded a collapse, Lucy Letby must have chosen to murder the child in front of the doctor treating him
Baby I - as with baby C, the prosecution experts had to swap their "suspicious events" around to match Lucy Letby's shifts.
Baby O - as with baby E, there was an opportunity for Lucy Letby to do something earlier in the day, if she really knew how to punch a liver without leaving a mark, but again, it's claimed he died of air embolism too. And again, a rash hours later when he was surrounded by panicked medics, who presumably didn't notice Lucy Letby reaching in randomly with a syringe.
Baby P. Who knows what happened to baby P? If you ask Dr Bohin, something must have, because the baby went from being well to ill with Lucy Letby in the room. The fact that a whole medical team was in the room with her doesn't seem to matter.
There is an awful lot of precision in the prosecution's records of course. It comes mostly from the swipe cards and the medical records. You get a lot of stuff like, at 23.12 nurse Bennion left the unit, at 23.15 nurse Letby signed for medication in room 2 ... but the timeline dissolves into bluster and guesswork when you try to pin down the vital questions of what happened to the children when and how.
The timeline is the most vaunted part of the case, and it can look quite plausible in snippets from newspaper summaries, but when you look at it more closely, it's one of the clearest signs that the case is a mess.