Thanks Matt,
I do dance occasionally, but in all honesty haven't danced really for years because if I spend the night dancing, I have real trouble walking the next day.
Johnny Weston is a regular dancer though, and you must have just not been on the same dancefloors. I'm pretty sure I've seen Cliff and Carl dancing, but not often, and have to admit I don't think I've ever seen Dave Welding dance.
I do think it's essential for a DJ to have a sense of rhythm, and to understand what makes people want to dance, but it's not essential for a DJ to actually be a dancer. Remember being a dancer doesn't bestow anything special except a sweaty shirt, and I've seen some pretty awful dancers who DJ.