This report from the American Journal of Physics describes research showing that the grip on a bat during contact with a baseball does nothing to affect the power delivered to the ball. Even if the hitters were to let go of the bat right before contact, the batted ball would have the same speed and trajectory.
%0 Electronic Source %A Nathan, Alan %D 2000 %T When Ball Meets Bat, the Hands No Longer Matter %V 2014 %N 22 November 2014 %9 text/html %U http://www.scienceblog.com/community/older/2000/A/200000553.html
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