It's interesting Patrick trusts Rosalind's judgement that Timothy Carter is not Red John, but when it comes to her description of Red John, aha, Patrick's skeptical of her. Neither one of these three suspects get even close to her description. The hot suspect of the week, Bertram, is the exact opposite of her description.
So what's the solution?! Just take it easy, don't think too much! This is a direct insult to ardent followers of the show. Heller can't just dismiss the first five seasons that easily and pick an arbitrary suspect that feels Red John'ish at the moment. There are a lot of elements a good show needs to hold, consistency is one of them. I hope all these spoilers are false, or at least partially true; even though none of them directly state Red John is Bertram. So I still hope there is this one last twist in the show, I really do.