I think he cooperated and stuff. Also on the abuse scale he was just starting to dip his toes in/caught out at the start of his descent.

It makes more sense for the police to sweep him up at this stage where has only a few incriminating files than to let him go deeper and potentially put kids in physical danger. He was a literal celebrity to kids and had access to them through school visits.

But the trade off is a pretty weak prison sentence. He'll still be paying for this for life, though.