I dont agree with this assumption he acted alone. what happened in the park was perhaps just PR and libby but how does this tie in with the screams heard by heathcote witnesses? Did she manage to escape, run down berisford or wellesley ave then got caught by PR or an acomplice not far from her home possibly walked down the street at knife point. libby struggles/ screams witnesses hear libby and males walking by(muttering) ? Telling her to keep quiet, then mumuring sounds , (probaby libby scared shitless) and the wooden door/ gate shutting and more screams. I THINK THIS IS SIGNIFCANT.. Lets suppose the screams were nothing to do with libby, wouldnt that person/ persons have come forward to say it was us? Its a shame the heathcote witnesses never looked at their window to see what was happening, if they had this might have been alot easier for LE to solve. Jmo of course