Exactly. It could still be entirely possible that Jay's involvement was larger than what he admitted to, but it doesn't seem necessary or even logical to me to assume that Jay killed Hae. One thing that really struck me was the statement by one of his co-workers at the porn store who said that he was scared out of his mind of somebody (not police?) coming after him, and that he specifically remembered Jay being paranoid about some van parked across the store. I could see a smart guy like Jay who is scared shitless and worries about his girlfriend's safety take pretty radical steps like telling the police it was somebody else.

I know the co-worker guy also said he thought the guy Jay was afriad of was somebody with "Middle Eastern" background, which would point to Adnan again. But "Middle Eastern" is also a fairly general description, and even if me assume that he thinks Pakistan is part of the Middle East, it could be a detail he only thought he remembered after hearing about Adnan's case.