Jay knew where the car was without being told and gave the whole story. Adnan doesn't remember how his day went even though he talked with cops which is fishy. His counter to Jay saying Adnan did it? Nothing. Jay knows who did it and it is most likely Adnan. I agree with you.
Btw I found Jay's and Stephanies facebook. I heard Mr. S also has facebook but I couldn't find it.
I don't think you can put too much weight into this. If we assume for the time being that he's innocent and just went about that day like any other day then:
- During that day, the Police was questioning him about the disappearance, and NOT accusing him as the murderer, therefore there is no need for him to retrace his step to figure out exactly what he did that day.
- Also remember that according to Jay, Adnan was smoking most of that day hence the hazy memory.
- Police finally questioned/charged him 6 weeks later, making it even harder to recall how that day went for him.
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Personally I think Jay really played Adnan here. Think about it, the only thing separating Adnan and Jay is the fact that Adnan has a motive (albeit a shaky one), if we can figure out Jay's motive - he can be just as guilty as Adnan.