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Kessel addition could give Penguins their best power-play unit ever

Now teammates, Sidney Crosby (left) and Phil Kessel could engineer a historically effective power play this season. Graig Abel/NHLI via Getty Images

Hockey analytics pioneer Rob Vollman is ESPN Insider's armchair GM, exploring how modern statistics can inform front-office decisions.

With a power play centered around Sidney Crosby and Evgeni Malkin, the Pittsburgh Penguins have already established themselves among the league's elite. Could the addition of Phil Kessel establish this season's edition as the team's best ever -- even better than those historical units dominated by Mario Lemieux and Jaromir Jagr?