I think pitmaster has become like the term "chef". In a commercial kitchen, the chef is head of something. Everyone else is just cooks. But in general conversation we tend to call anyone who is cooking a chef.
I think John T Edge gave a great talk one time on the term pitmaster which has lots of racial history behind it.
These days, basically anyone with a grill is a pitmaster. Just as people call someone like Rachael Ray a chef.
Incidentally Paula Deen is actually a chef because she's the leader of her kitchen staff.
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