I agree. It is by no means certain that the event even took place in the morning that Claudia failed to arrive at work. "Lone lunatics" tend to be tucked up in bed at the time that Claudia would have been walking to work (if the event did happen that morning). For a lone lunatic to have abducted Claudia on the way to work, he would have needed not just to have been roaming the streets at that time, but to have been in a vehicle. Claudia was a young woman and not small. Abducting Claudia on her route to work and holding her in a vehicle would have been difficult. If it was a "lone lunatic" with a vehicle, he also did a very good job of evading detection and disposing of Claudia's body.
Although the poster frequently refers to statistics, without quoting them, ex Detective Inspector Clive Driscoll said (in the Donal MacIntyre programme about Claudia) that such abductions are rare, especially so early in the morning.
The fact that none of the four have been prosecuted does not mean that there is "not a shred of evidence" against them or that the CPS "laughed the case out of court". It simply means that the case was not strong enough.