McAllister is the only one of the 7 suspects that has fallen for a Patrick Jane trick (see first episode), but then manages to squirm out of it with a plausible excuse.

Two suspects are dead now and Reede Smith appears to be an underling.  He also seems quite out of shape and doesn't fit the profile of Red John, since Red John would need to be manipulative in a charming manner.  He also doesn't seem to be old enough given the info we've learned about Red John's time spent at the barn in his youth.

Gale Bertram seems like he might simply be out of the loop.  It's possible that the mystery surrounding Gale Bertram that has been played up was due to the DHS and FBI request to funnel information to Kirkland about Jane. 

Bret Stiles is too sloppy with his followers.  He thrives on power given to him by his followers, but in doing so he doesn't choose them wisely.  I think there might be a tie between Bret Stiles and Red John.  It's possible that McAllister learned how to manipulate people from Bret Stiles, but rather than using that gift publicly, he uses it more discretely and selectively.  Bret Stiles would also likely have been identified by a psychologist in the same area as his Visionary.  Since Sophia didn't recognize him this helps rule out Bret Stiles.  She also described his posture as very poised and that fits McAllister more than Smith or Bertram.  When McAllister speaks politely it seems as though he's hiding something constantly.

It's easier to fake a lie when it's not a completely lie than if it were a whole lie.  I believe McAllister was actually afraid of birds, not heights.  We've seen Red John is likely left handed by how he holds the blade used to kill Patridge and McAllister saves Patrick from falling with his left hand.  A natural instinct to grab something important is almost always done with the dominant hand.

The DHS agents that broke into Jane's office stole the information for Kirkland, but nothing proves one of them wasn't a Red John conspirator and that agent could have sent the information to Red John as well.  If Red John had the same pool of 200 or so people he could have used some deduction to come to the same conclusion as Patrick.