Just something that I noticed when watching episodes that had the accused in them. The only one on that list that Jane has not made a mockery of is Bob Kirkland. 

That has been one thing that has bothered me. B. Partridge is the most likely suspect, but Jane has walked all over him. Red John is a "showman" and "artist". He sees himself better than others. Taunting Jane "Give up yet?". 

There is credible evidence that many others have pointed to Bob, but I hadn't heard anyone specify this.