It seems like Adnan is legally innocent but pragmatically guilty, he was able to remember all these details about Jay possibly cheating on Stephanie and how Hae found out about it, from a month before Hae went missing, but he couldn't remember what happened on the day that his ex goes missing even when he got a call from the cops and Hae's brother about it.

Even though he asked Hae for a ride when he had a working car in the parking lot, and went to some trouble to get Jay to get Stephanie a birthday gift.

For Adnan to be innocent, both Adnan and the police have to have had extremely unlikely events happen regarding this case, I'm no mathematician but the statistical likelihood of the cops making a gamble that Adnan didn't have an alibi, Adnan actually not having an alibi (since it's obvious that Bilal pressured Asia to write that letter), and Adnan also having engineered circumstances to be able to ask Hae for a ride that day, that should set off everyone's BS detector.

Like, whether the cops led Jay to the car or not, there was a bloody rag in that car that they didn't bother processing if they led Jay to the car. Is that really possible? What is the statistical likelihood of the cops gambling that there was nothing in the car that would help them solve the case properly, in order to frame Adnan, and Adnan actually not having an alibi and also going to deliberate pains to get into Hae's car with her?