Imagine that Doc Louis and Mr. Sandman are brothers. They both wanted to be the champ, and both trained as hard as they could. Both made it all the way to the Champion, but Mr. Sandman got there first. Doc Louis couldn't bear to take his brother in the ring, so he realized that he would never become the World Champion. He spiraled into a deep depression, causing him to gorge on chocolate bars. And then he met Little Mac, and realized this kid had potential. His potential. So, he placed all his hopes on him.
Of course, most people probably believe this just because they're both black.