The probable presence of JC with SL in Shorrolds road was amply corroborated both by a neighbour and by passing witnesses who placed SL either with JC on her own or waiting outside for him, at the time in question. All these witnesses would have provided formal statements to police.
Confirmation of facts in a case like this would only ever made in a court when witness evidence is tested under cross examination and put to a jury.
DV's preposterous theory undermines the principle of an investigation being of necessity, evidence led. It conveniently ignores all the evidence which indicates JC as the main culprit.