Leonard doesn't, and couldn't 'use' his size here though. He's not gonna grapple and clinch Floyd, weigh him down, and he's not gonna land clean...
There is a very good documentary on Sky Documentary channel where the back story to that famous line is given. I'll not spoil it, we'll worth a watch.
Didn't always agree with old Colin, but he was a proper old journo with a knowledge and passion that shone through. And he was not an arse kisser...