I think this is being over-complicated somewhat.
There seems to be an assumption that older teenaged girls (and boys?) say 14/15 who manage to have some kind of consensual interaction with someone they idolise will then randomly report them for molesting them decdes later. That seems to me to come from the same place as the idea that women have consensual sex which they regret the next morning and go and report the man for rape. ie it assumes that people who say bad stuff has happened are lying about activity that was actually consensual, for some reason that is never fully explained.
Secondly we are talking here about children of a variety of ages coming forward separately to report. If they are reporting then presumably they are not happy about what happened (in accordance with the first point) and given the timescales involved I sincerely doubt that the police are going to act without a fair number of victims who tell corroborative stories and don't know each other.
I just think that it boils down to "we believe you". If a person or people say that they were abused by someone, then the starting point should be to believe them and investigate. In this situation too many people seem to take the starting point that the victims are not being honest.
If a man has a string of 14 year old girls lodge complaints about him having sex with them, then the right thing to do is to look into it, right? Not to say, well, I dunno, 14yo girls have consensual sex sometimes, and even though they don't make police reports about it, well still it casts these accusations in a different light.
I don't really understand where people like Anne Diamond are coming from with this.