CAUTION SPOILERS AHEAD!
Bruno said early this season "I know some people will be disappointed when we finally catch Red John", and I know this is true today and this would have been true no matter who they choose, I know everybody had their favourites and to be honest McAllister wasn't my favourite either, but let's face it; it makes perfect sense. They did a good job and everything was perfect. Yes, the trailer spoiled a little, but remember that nothing was certain (everybody said that young boy at IMDB was the young Red John.)
How do you find this theory?
plausible
unlikely