I have to admit, I'd be concerned about taking a KB overhead with a crush grip, myself. I've seen a vid in which a female takes a 20kg KB overhead (top of skull) and holds it there for a second or two before lowering, once again not something I'd be comfortable with due to the extreme potential for injury to the skull.
Crush grip is brutal though and the thrumbs aren't necessary around the bottom of the KB as seen in the vid above.
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Doh! 
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