If Mcallister is the real Red John, maybe it's possible that a other killer appears later. Imagine someone who imitates Red John, who sign too a bloody smiley. Maybe Red John's son. Him, he could be Mcallister's son and wanting to revenge the death of his father, no? :( http://static1.wikia.nocookie.net/__cb20131211031861/thementalist/images/5/5e/Fbi_agent_jason_wylie.....)

If Mcallister isn't Red John, for me, it's Brett Partridge ( or Stiles ).: https://scontent-b-mad.xx.fbcdn.net/hphotos-frc3/t1/554428_10151444533345607_502628388_n.jpg

Before the episode 8, i trought Red John was Michael Kirkland, Bob's Brother, and he had to change identity and face, and had become Brett Partridge...it would have been cool, no? 

So, good night, and sorry for my english very bad....

Tiger, Tiger...