I am going to steal that word! Innosimps is just perfect!My reckoning is that even the defence experts couldn't justify a more likely natural explanation for each episode of death or harm, in babies that were otherwise mostly doing OK. So they'd have been torn apart by the prosecution.
The first thing the prosecution proved was that there was deliberate harm, the second thing was that it was Letby causing it.
If it wasn't Letby, then the Innosimps (and the hospital) still have to explain how so many babies came to unexpectedly die or suffer harm on that ward.