Hae's car is the problem with that theory. Jay was in Adnan's car but Hae's car is the one that ended up halfway across town. Jay would have needed some unnamed accomplice for both Adnan and Hae's cars to be involved. Someone had to drop Hae's car off at the pier (or where ever it was found) and then Jay would eventually return Adnan's car. Also Jay was a skinny guy and Hae was an athlete so I find it hard to believe that Jay could have choked her out on his own. Which means Jay must have had an accomplice, which means he probably premeditated it, which means that conversation where Hae confronts him and he snaps wouldn't make sense. I doubt Hae would confront Jay if he was with some other dude in Adnan's car.

I'm pretty sure Adnan did it, but the prosecution's case against him was bogus. He didn't deserve to go to jail based on that evidence. My current theory is that he is a sociopath and he's got all of America hooked line and sinker. You say a guilty person wouldn't say 'I don't know' or 'I can't explain that'. That's what a dumb guilty person would do. A brilliant guilty person (and Adnan was very smart) would act just like he would if he were innocent. It's what I would do. I'd probably act just like Adnan did if it were my case and I was guilty.