After watching last nights episode. I believe Rob is Red John. 

I think Red John has hypnotized Jane to forget him, I think he met Red John/Rob on the carnival.

Think about it? 

When Lorelei was murdered who was there? Rob. She was murdered in a place full of carnival things. Hello people.

Then when he first met Rob at the CBI Patrick says "Do I know you?"

If you watch the clip from 4x23 or 24 when Jane is in the limo with Lorelei listen to the voice especially when he calls him Patrick and so does Rob they sound very similar.

Going on the conversation Rob has with Jason he could very well be Red John, however when he gave that drug he wore no gloves so the finger prints would be on the drip right? 

Also, when he said to Jason "Good, your mind is clear." this is something a hypnotist would say. 

Secondly when Jane arrives, and he asks him what happened. After he says "He said nothing." he taps Patrick and the arm and walks away, Jane turns and looks on as if something is triggered.

Yes Rob is very much a suspect now.

Thoughts?