He's 270lbs and 12% bodyfat in the offseason.
He's 285 and contest shape two weeks out.
That's probably about 30lbs of difference in muscle size considering bodyfat changes.
He's probably not off, but he definitely plays it a bit more safe in the offseason. He starts getting ready almost 5 months out of the O, so his offseason is only 7 months, and he loses 30lbs of muscle during that time. That's some pretty rapid weight loss. I'd guess that when he's done competing, that 30lbs becomes 60lbs with a whole year off of competition.
I'm sure he thinks he'll hold his size without the gear, but if he's losing 30lbs of muscle in 5 months, WHILE training hard.....he's not exactly holding his size.