The whole bizarre story he apparently concocted about being mugged, the timing of his visit to the ER, the truck ending up in TX and his apparently renting a car...all of it says to me that he was very much on his own in this crime and feeling his way through afterward in a very clumsy, not too bright way. I also agree with a previous posted that he was probably not specifically "trolling" for a victim that night (just a guess on LE's part, IMO) but rather saw Mickey and his instincts took over, which is why everything else is such a mishmash afterwards. He didn't stop to think about video, about what he would do with her bike, with her body, etc...and then if he ended up with injuries, that was another thing he suddenly had to deal with somehow. And days later, seeing his truck on TV started the whole chain of events that led him to burn the truck.
This has always been about one perp, one random victim to me. Nothing preplanned to any degree, no stalking in advance, no ties to Mickey or her friends, etc...she was there, he drove by.