I'll second that!! I think DC was right on the money when he said Jones was clean in the OSP fight. Jones didn't like how he felt, and realized he had no chance if he faced DC like that. So he went right back to the juice.
However, he was already caught using estrogen blockers, so he probably was nervous to use them again. He knew USADA would be looking for those same drugs with a microscope. But that meant he couldn't use his regular steroid cycle, since the estrogen blockers are required to mitigate side effects. Thus, he probably got the idea from someone to use Turinabol, which has fewer side effects and doesn't require estrogen blockers. Boom.