AMC: Could ALEXANDER CAMBIAS Have Killed STUART ...?

I'm glad you and I agree. I put Alexander Cambias as my answer when someone posted a question about who did it and I got 5 thumbs down. I heard that the writers said it will be a shock and it involves Dixie's death. That lead me to think Mr Physo has escaped from the mental ward and tried to kill Adam. I just can't figure the motive. A lot of people are looking suspicious lately.