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For example, on the HR, look at the whippiness of the rebound after he finishes his followthrough. That's wrists and forearms.
Some guys waggle the bat around, in setup, like it weighs absolutely nothing. Zunino from the elbows down has got some serious mojo goin' on. So did Edgar.
Don't think that Zunino was their first choice, but looks like serious upside to me.