Cluciano, I find my own thoughts mirroring yours. I think BSL spent many nights just driving around, looking. Unfortunately, this time he spotted Mickey and circled her until he found the right time and place. I do think he got more of a fight than he anticipated and Mickey hurt him. At that time, he has to get rid of the big pieces of evidence and jumped on I10 and went straight to Whiskey Bay where he dumped the bike. Personally, I have the same feeling Tim Miller has, that he also dumped Mickey in the basin there somewhere as well. I think he then jumped on State Route 975 and took that up to 190 and back home.
At that point, if he did keep any "trophies", he hid those, he tried to take care of his injuries, but realized that they needed medical attention but knew he couldn't go anywhere locally. He then has the long drive to New Orleans to come up with his "mugging" story. After giving LE a statement there, he probably went away feeling fairly confident he covered his tracks. He got rid of major evidence, he confronted LE with no major problems and up to this time, there was no news of a missing Mickey. That probably changed a short time later. He probably got interviewed by LE, as an RSO, and pictures of the DWT were released, sending him into a moment of panic where he decides to burn his DWT. Of course that is all just my opinion and only time will tell.