When Flex did their Big Picture article on Mike, he was pictured with his dad, who had HUGE calves---the mofos were cows. His dad was overweight, but you could see that Mike got his calves from his dad. Now, how much he trained them, who knows. He had consistently stated he rarely trains them for yrs.
True, James Lewis had a segment on the fitshow a couple years back, and he showed how he trained calves, and he trained the shit out of them.
FWIW, I do usually 2 to 3 exercises for calves, seated, standing, donkey, that's it. Sometimes drop sets, but mostly just heavy.