EXCLUSIVE CONTENT Get ESPN+ Puck-moving defensemen give Tampa Bay the edgeElsa/Getty ImagesFacebookTwitterFacebook MessengerEmailMay 27, 2015Rob VollmanSpecial to ESPN.com CloseHockey analytics pioneer Rob Vollman is ESPN Insider's armchair GM, exploring how modern statistics can inform front-office decisions.Follow on TwitterFacebookTwitterFacebook MessengerPinterestEmailHockey analytics pioneer Rob Vollman is ESPN Insider's armchair GM this season, exploring how modern statistics can inform front-office decisions.