Just a theory here, what if Bilal mollested both Jay and Adnan. Then Bilal kills Hae Min Lee cause Adnan told Hae Min Lee about the abuse and recruits Jay to help him. Jay and Bilal decide to pin it on Adnan. This way, Adnan really wouldn't know what went down but doesn't want to incriminate Bilal cause he's ashamed of the abuse.
Just a theory here, what if Bilal mollested both Jay and Adnan. Then Bilal kills Hae Min Lee cause Adnan told Hae Min Lee about the abuse and recruits Jay to help him. Jay and Bilal decide to pin it on Adnan. This way, Adnan really wouldn't know what went down but doesn't want to incriminate Bilal cause he's ashamed of the abuse.