I'm catching up and saddened to hear about Sarai's death...
Some random thoughts (IMO, MOO, all that)
From the beginning this has seemed personal & emotional to me. I'm STILL of the mind that an American mother doesn't take huge risks like foreign travel to a country that has US warnings and travel advisories, plan to go with a friend then decide to go alone to stay in a hostel and couch surf JUST for pictures taken on her iphone. A fairly NEW hobby I might point out. There was something "more" that was luring her. It's possible that Sarai was just an incredibly trusting individual but I don't get that vibe at all. She's a NY'er. Her husband comes across as a street savvy kind of guy.
IMO, that lure was romantic interest or perceived romantic interest. Having been someone who has done her fair share of internet/long distance dating, it can come across as amazingly romantic. Online relationships are free of any fault. They are flawless. The person on the other end is perfect. Add in the lure of meeting in a city rich in landscape and sharing a mutual passion in photography and you have the perfect recipe for a "dream" come true. Something worth taking such a big risk for. Rumors of discord in Sarai's marriage don't surprise me at all. I know they are unconfirmed RUMORS at this point but it fits with my feelings all along on this.
Some have said that doesn't fit, she was in constant contact with her family, her husband, her kids. I see two likely and possible explanations for this. #1 Guilt is powerful force. #2 Maybe once she arrived "Prince Charming" wasn't exactly what she was expecting and she longed for the comfort of the "known" versus the unknown. This can be supported by her wanting to come home early. The reasons she gave for that, to me, are pretty irrelevant. It just points to the fact that despite outward appearances of a good time she didn't want to be there as long as planned.
IMO further support is the personal nature of how she was killed. This wasn't a robbery gone bad. (jewelry still on her body, some of it buried?) This wasn't a random sexual attack (assuming prelim rape kit reports are right). This wasn't a fall (you don't get beaten unrecognizable from a fall at that height). This wasn't a gang / drug mule / organized crime (I doubt if that was the case they would have found her at all).
It was personal. Someone didn't want Sarai to leave. They didn't want her to return to her husband and kids. It was a crime of passion. Someone was incredibly angry at the circumstances. Maybe he was rejected. Maybe he wasn't and simply couldn't bear to let her go. Whomever did this .... believed they cared about Sarai. The place her body was left is NOT a coincidence. Look at her art and look at the surroundings of where the body was found. Whomever put her there did it in a poetic way, almost romantic. They did it because they knew it was a place she would have loved.
And her jewelry was buried? There's something to that. Whomever put her there didn't want it taken from her.
I go back and forth with theories on if it was Taylan or if it was someone else. It could have been Taylan but it doesn't quite fit. He was well educated, he knew he would be quickly connected to her, he knew records would show he was supposed to meet her very near where the body was found. He was quickly released by authorities which tells me he either had a solid alibi OR he gave them information that led them to a "real" suspect.
Maybe she was spending so much time with Taylan because he was protecting her from another guy ? It would fit as to why he was released so quickly. He could have told them, look, Sarai and I became friends. While she was here she met up with XYZ who couldn't take no for an answer. I've been spending time with her because that guy was making her uneasy. This theory may also point to why the two trips OUT of Istanbul. If things went south with who she originally intended to spend most of her time with and she was uncomfortable, maybe she then decided to go visit with IG friends in Amsterdam & Munich. (which may have further enraged whomever did this)