From Yahoo Sports:
"I’d like to test myself and I always love to take on new challenges," Silva said of his thoughts about a drop to 170 pounds from the middleweight limit of 185. "It’s not that I want to go fight Georges St. Pierre for his title. There’s no doubt in my mind that he’s the reigning champion, the absolute champion, in that weight category. But I just want to test myself and see how I’d do at that weight."
Silva, who recently signed a new eight-fight contract with the UFC, said he hasn’t made 170 pounds in about five years. He’s not looking to campaign in the division, however, and two fights at the weight wouldn’t change that, even if he were successful.
I know that's a scary thought right? However, most people probably forgot that Anderson Silva was the 167lb Shooto champion. Of course, Silva has enjoyed two fights as a light heavyweight at 205lbs, ending both fights in highlight reel fashion. So with a successful move to the welterweight division, Silva could legitimately say that he is the best pound for pound fighter in the world. If Silva were to test himself at 170 lbs, who would you like to see him fight first?