Silly.
It's not steroids.
He's on bio-identical hormones.
And increased his daily intake of sodium to 10k mg per day.
Sodium is anabolic.
He gained 32 pounds of "solid" muscle in a matter of weeks.
You guys know nothing about building muscle.
I could believe he is natural. Though he's been pretty damn ripped in the past - he was 152-lb for his Floyd Mayweather fight, and was incredibly lean for a fighter.
I wouldn't be surprised if he has used in the past - or now, for that matter. But I could also believe he's not using.