Actually he will be working with Bob to stop Matt's dad,This has been revealed in a spoiler.
Also everyone has to remember that Maury while he is the nightmare man is on the list to just like Bob and we have yet to see the 12th member in the photograph.
Again I just cannot say how great I think this show is just fantastic all around.
How do we know Maury is on the list? I thought is was obvious that Maury had a picture of himself covered by the godsend symbol because he was using it as an alibi to throw off any suspicion. Plus another member on here posted a screenshot of the original 12 and there was 12 people in the picture.