I think it's possible. Just because we assume something was A doesn't mean it is, and considering how early he was around in season 2, it's likely that he was in Rosewood that night and we know he came back because he found out that Peter was his father. He could have heard the rumours that Ian killed Ali and didn't want him hurting Spencer too.
Hoenstly, I'd love for that to be the case and the A team just took advantage of the situation by moving the body.
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