Common mistake that dunking comes from the calves. Just look at most NBA players very small calves. It mostly from the hams and gluts. So train them hard.
I am 6'2 white and 220 at 10% and I can dunk like a black dude. I have been able to dunk since I was a junior in high school and that was 16 years ago .
When I was a senior in high school I was in the Hoop-It-Up dunk contest and took 4th out of about 10 guys. Most that did worse than me missed the dunks so that played a factor in why I did better.
Now I am no Vince Carter but I can just about touch my elbow on the rim.
I suffered two broken ankles and an ACL in college so my basketball dreams faded fast.
BUT....
He said he neverplayed team sports!!!!