Hi can't..just come across andread all of your thread. So sorry you are having such on-going concerns and the police haven't been more helpful.
I do have experience in this sort of thing, and wanted to say some things which may assist.
Such men are not attracted to all children, in the same way not all men are attracted to every woman - so it does not by any stretch of the imagination mean that he must have been attracted to your children in an exploitative way.
In addition, when they were growing up, he may well not have had these thoughts and feelings for children...peoples sexuality changes throughout life, and it IS common for such things to emerge in 'mature' men. So those precious times you talk of, and the trust you felt, and dd's love for him, can be authentic, for all concerned.
I do understand the invitation to anxiety, but you will never know now the answers to the questions you ponder. There will be 'no result' as the only person who can do this has proven to be 'unreliable' and perhaps motivated to maintain some rel. with you and may say anything to acheive this. To my reading, you must make a disciplined effort at placing that part of your concerns in a mental drawer marked 'unanswered questions'.
As for the court case, cod is obviously right that 100 images is a very modest amount. If you or dd (why does she wish to go?) do go, prepared to hear of thousands more like. The number ISN'T linked to his level of deviancy - abusive images of children are "traded" in large caches, so a person may only be 'interested' in one or two images, but will be required to receive hundreds to acheive those.
As for 'personal culpability', there is sometimes a hierarchy of offenders whereby 'downloaders' belive themselves to be not so 'bad' as contact-offenders, as they haven't created any victims, as such. The vast, vast majority of 'downloaders' I have come across would balk at the notion of committing a 'contact' offence - it takes a different mind set to do, and means breaking another set of 'taboos' entirely. Hope this provides furhter re-assurance regarding your own little ones, when they were little.
There is such little chance of the CC hearing to be on a Saturday Iwould dismiss it. I don't know how you would find out, apart from asking his solicitor, or trying Court Listings. Courts are public places so they should tell you?
In any event, good luck with it, and I hope you do discover things to put your mind at rest