Actually, he may have been working very hard on his muscles but they may not have developed the way he wanted them to. Some people naturally have muscles that develop better than others. Think about your own body. Aren't there some muscles that would remain semi-toned even if you never worked out? I bet there would be. Aren't there some muscles on your body that no matter how hard you work out you can't get them to look perfect? I bet there would be. For instance, my boyfriend would have nice legs even without working out while I would have chicken legs if I never worked out.
(and they're still not 100% what I want them to look like and they probably never will be...that's just the way my muscles are shaped) It's all up to genetics. That guy's genetics gave him chicken legs.
But, I don't think I'd ever get calf implants. They looked so fake!