He did say something in 2008. I'm just not sure if it was before or after the election.
He was pretty straightforward about what he knew and didn't back down when accused of being a crackpot. He was an Obama supporter as well.
Then he got a college (teaching?) job (in Tennessee?) and decided to drop off the radar because he was getting too much attention and did not want his new employer disrupted.
My guess is that the recent affidavit was a result of Sheriff Arpaio's investigation, but I can't be sure about that.
I believe that I read that Adams is teaching at Western Kentucky University.