Arreola doesn't look any fatter than George Foreman did at the same weight. Foreman at 250 pounds was soft and jiggly. Heck, David Tua was only 5'9" but he could carry a lot of weight without looking slovenly.
There are 1,113 registered professional heavyweight boxers. For Arreola to be in the top percentile, there would have to be only 11 or 12 guys who'd beat him. I think as weak as the division is there have to be (between the Klits, known contenders, and yet-unknown diamonds in the rough) more than a dozen guys who are the match of Arreola. Hell, there might be close to a dozen cruiserweights (basically any of the top 20-30 guys with very good chins and ability to keep using movement without fading) who could beat him. Hopkins too, probably. Even giving up a shitload. We sure as **** are. We're going to find more reasonable arguments than "Ewww, he should lose 65 pounds and be a light heavyweight!", though. :yep