The whole idea of using a hook grip is to get the kind of grip security you do with a mixed grip, only with a double overhand style. It's nearly a neccesity in OL (moving fairly heavy weights THAT fast requires the hands to be able to resist a ton of force), and for PLers it would cut down on bicep tears big time. Bicep tears are one of the most common injuries for PLers/strongmen. It's usually related to excessive steroid use and lack of curling, especially in the case of powerlifters. Strongmen may be just as jacked, but they do curls, however, they also put their biceps in much more vulnerable positions than a PLer ever does in competition.