I have been following this case since the beginning, but have never weighed in until now.
From the first day this broke open, the entire case has just been ODD. There are just so many things that don't make sense. Specifically, the actions taken by BL and the subsequently seemingly strange behaviors of RL and CL. I am happy to see a number of theories surfacing in which BL might be innocent. Do I think he's innocent? Likely not...Occam's razor and all that. And yet, the possibility is there as none of us really KNOW anything beyond the scant (and ever-changing) facts available in the MSM, so if everything in theory and conjecture, then we should consider all of the possibilities.
Some of the oddest facts actually make more sense in the context of BL's innocence. For instance, if they had set up camp on the 27th and then had an argument or something and BL decided to take off on a solo hike, then he would likely take only a tarp since the tent was already set up for GP. So that would make sense that maybe he was off doing his own thing and that maybe someone else came along with nefarious intent.
Assuming he returns and finds no sign of her...waits around for a day or so and she doesn't come back...or maybe even happens upon her body and assumes he will be the prime suspect, he then decides to take the van and go home. Is that what most any of us would do in similar circumstances? I don't think so, and yet, none of us really KNOW what we will do in any given situation until we are faced with it. I'll spare the personal examples, but I know this to be true and I expect many others here do, as well.
The DeSoto camping trip also makes more sense if you assume the parents didn't have any clue what had really happened until after her family reported her missing and the police got involved. It also makes more sense if BL didn't know what had actually happened to GP. Of course, he could have been in denial or he could have been thinking he was getting away with it and gloating, but I think MOST people who had just committed a murder (specifically an unplanned one, which would make the most sense also given the other facts) would be doing anything but going on family camping trips. Then again, acting normal is probably one of the best ways to cover, and if her discovery would have taken a little longer...
But again, then it doesn't make sense to take the van. He was willing to hitchhike, so why not hitchhike home or to an airport or bus station? It would have been easy to do so and then claim later that they had argued and decided to go their separate ways and that he had left. It would be very hard to prove, beyond a shadow of a doubt, that he was the perpetrator.
I mean, honestly, if he did kill GP, then every action he took afterwards makes no sense whatsoever. If he didn't then it does make sense that he might have started freaking out about going towards...say...Jackson, and change his mind and want to go back to check on her. He could have started feeling guilty about leaving her alone in the wilderness and decided to go back. And then we come back in a circle to how one should react in such a situation when they've returned and can find no sign of their former beloved.
And then there's the Carlon Reserve:
If you're going to head out, on foot, to elude authorities, why would you drive your car to a place that would give them a starting point? Especially considering that as the crow flies, the reserve is only about 4 miles from the house. If you're about to spend unknown numbers of days living off the land and hoofing it to do so, why wouldn't you just walk into the reserve? You wouldn't have to go all the way to the main parking lot to go in, either.
You might have to cross a canal or two, but it wouldn't be impossible. If you're braving the elements in Florida, then you should have the wherewithal to get across a canal. I'd much rather chance a gator than live out there with the bugs. Gah! I lived in North Port and Port Charlotte long ago and while it has changed and grown a lot since I was there, I'm willing to bet the bugs haven't changed.
I've just typed up many of the factors I think could point to his innocence, and which make the available facts seem to better fit the puzzle; yet, I think the likeliest scenario is that he did it and ran, and the Mustang was a false flag designed to extend his already considerable head start. Whether his parents are complicit or not, I can't speculate, but I feel fairly confident they had no idea of the true picture until the 10th or 11th, and probably not even really until after GP was discovered.