Remember Haffner warned Lisbon and Van Pelt about an imminent danger caused by Jane? Back then I thought he was warning them about the Blake Association, and I thought Haffner was Red John and an ordinary member, and that he was warning Lisbon out of love. Now that I know he was neither Red John nor a member of the Association, I can see the possibility of there being a new threat.
Haffner was either warning them about the Blake Association or not. If it was about the Association, one might wonder how he knew about them while he was not a member, and why keep it a secret. The second possibility, If it was not about the Blake Association, then who was Haffner talking about? Add to this his persistent efforts to collect info on the Red John case and his frequent references to "a client"! It didn't look like Stiles was interested in the Red John case.
Haffner was the only suspect other than McAllister who had a complete pre-RJ sixth season episode dedicated to him. Could be an indication of a new plot.

Or there's always the possibility of things not making sense at all!!! You know it's rather interesting, our obsession with details comes from Jane's obsession with details. For five seasons we had been taught to be as sharp as we can, then suddenly "the details don't matter"!!! That was a very stupid move on the producer's part, even insulting.