I don't think he's a must start yet. I drafted him as a sleeper in many leagues and he started off on the wrong foot with his behavior issues. He had a good game last week, but his stats were skewed because of that lucky hail mary tip catch. If you took that away, it was just an average game still.
I'd say wait to see what he does against the Vikings (unless desperate at the wr position) and then scale his amount of targets and playability.