If size didn't matter then weapons or even the gun would never have been invented. You don't see a chihauhau attack a great dane do you. Of course I'm exaggerating but you get the idea, however your example is based on statistics not the real world.
From my comments: Think I'm wrong? Why do fights have weight classes? Let me guess, it's all about entertainment right? You're in for a real rude awakening if you think so.
Everything matters in a fight. But size does not determine the outcome of a fight.
Size will not give the person the advantage. Skill will give the person the advantage. Knowledge will give the person an advantage.
There is no statistic available to give a percentage of success or failure.
hes asking specifics
a 10 inch dong vs a 2 inch dong is stretching it
but hes asking a 30 pound difference
so yes somewhere there is a trade off
if it were 10 pounds i say flip a coin
not so with 30 pounds in that weight catergory
It depends on the person, Bruce lee or Muhammed Ali ? tuffy.
Let's say we have two guys both untrained and both 6 foot. One's 180 pounds and ones 150 pounds, both being muscular. Would the 180 pound most likely win? Percentage wise how much of an advantage does the 180 pound guy have? Just curious
