I've done several re-reads and I'm on yet another, but I'm still pretty new to the forums, so I was just reading some old posts, and while reeading one about Bashere being a DF, someone said Tuon(aka Semirhage). Did I miss something, or is this the common belief these days?

The person is wrong. We get confirmation of who Semirhage is posing as in KoD. She's Anath, Tuon's Truthspeaker.

 

Though the person may have been referring to the end of CoT and KoD. When Bashere says that Rand has a meeting with Tuon, Tuon is really Semirhage using Illusion. Thus when Rand goes to the meeting Semirhage's weave is broken by Cadsuane and they kidnap her.

Cool. As I have forgotten that I was a little confused. I'm only on the Fires of Heaven right now, I was so confused during TGS i owed myself a re-read.