My sister's cross country runner boyfriend has more leg mass.
he actually has a disorder in his leg; polio, i think. watch him when he walks. i've danced with and against this guy (bboy Junior from Wanted crew out of France) at rocksteady anniversary in 2001, i think it was. the guy took an affliction and rerouted it into a style that drops jaws.
also, here's a more extreme case, lazylegs. i also met this kid at RSC anni, but in 1999, i think. also some guy from Austria that had one leg way shorter than the other, but dude was ripping the jam a new asshole with the power he was throwing out.
anyway, lazylegs:
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honorable mention, Bill aka crutchmaster:
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I did a show with this guy and few others back in 2002. Since, he's moved on to choreographing routines for shows like Cirque Du Soliel, actually teaching the guys how to do the movements and dancing he does on his crutches.
Shit, sorry to turn this into a post about breakin and dancing, but whatever.