Every big, top bb has a lot of that. Unfortunately you can't control where increased weight goes. Even Phil Heath had a massive belly. It help if your torso is on the longer side, "stuff" can hide in there more comfortably
Aside from potential organ problems, and certain organ enlargement, Milos who had a small waist, said every bb has a big liver for example. Not just from drugs but from what I'll call the
Foie Gras Effect 
Also the stomach muscular tissues for sure get stretched out with massive food intake, for example, a regular dude may eat one chicken breast with one meal a day, whereas a big mass monster might eat 20 a day, as Nasser said he did. Add the rice and perhaps fibrous vegetables thst swell in the stomach. Some have gone as high as 800-1000 grams of protein which then makes you thirsty as hell which makes you drink a few gallons of water.
Walker is perhaps "ugly" but you have to appreciate the sheer mass as well which is hard to even fathom.
