I agree with your post. When I see their videos and pictures, I look at their body language. Something about it has always make me question their relationship. I think BL was in love with GP, but GP appears to be posing; not really wanting to get too close. It almost looks like something you might see in a travel brochure. He looks at her longer, and he leans in more. She on the other hand, looks at him sort of from the side or leans away. She has much more eye contact with the camera. Part of me believes there in lies a major part of their problems. GP wanted a travel buddy to project an image, and BL wanted to hike and be hidden away with just GP. Two people with different paths thinking they are on the same one, but just caused more problems for them.
After the new MP information, I question if it was even GP and BL , at all. It could very well have been another couple. No credit card info, no surveillance, and the manager sees many patrons each day. I don't question that a couple may have tried to walk out without paying their tab, but I wonder if it was another couple. We all know how similar BL looks.
I am questioning if GP was even alive on the 27th. She may have died August 26th at Spread Creek. Perhaps, the night of August 25 to early morning of August 26th. Whatever the date, I believe it was another fight similar to the one in Moab. This fight was in such a remote place that it escalated in GP's death. JMO