Is it possible? Yes. I bulked 10 pounds in one month. Was he using something ithet than supplements? More than likely. But here is the thing, as much as you might think roids is an automatic cheat code, you still have to put in that work. You still have to change your entire mindset. You still have to get into the gym. And because you heal faster, it means you are spending more time in the gym. That's the tough part. Dedicating 4 hours a day to the gym. It can get boring. Eating clean can get boring. Not drinking, smoking, partying, but instead sleeping at 9 PM every night to be up at 5AM can be boring.
The real cheat code is cocaine. Especially for athletes, and definitely fighters.