This is false ask anyone who has wrestled or done any form of Karate, I have done both i'm very short in size but stocky. Most people who I have sparred with hated me because we are faster than the bigger guys , so therefore we get alot more attacks in than they do.
ALso when it comes to grapping us most of them can't as we are faster again and we have lower center of gravoity these are factors as well, and I know from experince. I have been hit by guys that been doing Karate, and fights in general by bigger guys , yes they hurt but mosta re to damn slow to even land anyhow and we have better dodge effects than they do.
So if you wanna compare size we can do that all day. I know this is not a Karate game but it is fighting so it is the same factors.