very low, but conditioning seems to be what wins Mr. Getbig
so if I can add another 20 pounds of muscle and be at 4% I could win it hands down
AXA bro, I've said it before and I'll say it again...you have good potential but need to be realistic at times. Have you seen the pics of Jrod in contest condition? I'd wager thats 5-6%. I've been there before. It sucks and it is incredibly difficult to get there and maintain for a length of time. I don't honestly know if you can put on a LOT of muscle and diet down to that level naturally in time for the next GBIV without wasting away. You might have the genes to do it but that is statistically unlikely. And if you have any kind of faith in ADP then its a wash.
20 lbs. natty, hahahahahaha!
unattainable without drugs 
He didn't specify 20lbs of what.
I myself actually plan on putting on 20 lbs during the holidays in an attempt to finally break 190 for the first time in my life. That 20lbs won't be all muscle.