That's certainly possible I think,Sera.
If not, its unusual that theyve been lablled as witnesses imo,as it implies that there is something to be a witness TO?
One thing crossed my mind is that although its stated that the footage spans approx 1.35am-2.35am(?) and we see different people at diff times, do we have definite times attributed to each person/persons? Another member posted a Q if the footage is in chronological order but cant find it.
Also, if the order of clips IS chronological, its still not unrealistic to theorise that its LS + PR(?)/ A N Other in last clip and that the others are being sought as genuine witnesses to something that LE suspect/know happened AFTER the cctv, hoping that the others may still have been loitering in the area( the bike is esp hanging about back and forth...why not for another hour or two after also?)
Maybe we assume too much they are important for what theyve just seen, rather than what they may have seen later?