So there shouldn't have been any questions asked about why more babies were dying, because, random distribution?
The questions absolutely needed to be asked, and it turned out that these deaths couldn't be handwaved away because the babies were young or premature, or because the unit was understaffed, or because sewage was backing up, or any of the other reasons that apologists are now saying.
If any of these were the reasons for the deaths, dont you think the defence would have said so? Each baby was taken in turn and the expert opinion for the deaths given. There was ample opportunity for the defence to have presented this at trial. But they couldn't. Because at the time of collapse each baby was stable and expected to do well, and when they did collapse, resus didn't work.
To make the defence more than 'I can't remember what happened, and I didn't do anything', the jury needed to hear an explanation of how this could be happening that didn't involve Letby, and they didn't.