Just because that's where he was lined up doesn't mean that was his responsibility. He ran with the TE from the snap.
I'm not a fan, because if you are going to double someone in man, that technique is NOT how you do it, especially versus a slot player. But he did what he was assigned. I'd loved for him to have better eyes and be aware of the route concept from the other side of the field to be able to run over the top of the opposite crosser. But he was put in a bad position from jump.