I still think it looks like a woman leaning into the passenger side. Look at the ankles.
Also, GBC does seem to be lying down beside the security guard - there is part of his hair showing to the right of the security guard's leg. Also, the passer-by is looking down at his face.
Also, IMO, if he was injured, as has been reported, it would be unlikely that he was walking around and rummaging in his car. I also believe the security guard would have stayed close to him too (i.e. just in case he was under the influence, he would know the police would want the driver to remain at the scene).