Sullivan and staff coached a worse power play than the Sabres this year. That's a PP that had Crosby, Malkin, Karlsson, Guentzel, and Rakell for most of the year.
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I don't talk puck with my PA buddies as much as I used to, so I don't know what happened there. But the numbers are enough to justify a deeper dive to see what happened there.
The reasonable folks on the Penguins board and in other places have thought Sullivan outlived his usefulness as their coach four years ago.