He's probably not as lean as you would think. I'd put him around 8%. The bigger you are the more bf you carry, so a guy like Marcus or Ronnie are shredded at 8%-12%bf.
The problem you are encountering here is the thought that this guy is as big as Marcus or Ronnie. If he is 6 foot tall, which I doubt, this guy looks to be about 190 pounds. He's nowhere near the 320 pound offseason weight of a Ronnie Coleman. Of course, he looks to have a legit 28" waist, which I would much rather have than the 40" bloated gut Ronnie sports. My trained eye would put him at about 7-8 percent definitely. He kinda reminds me of a young Flex Wheeler before way too much juice and gh took their toll.