With or without Zucker, I still would have considered the Penguins a Stanley Cup contender because they always seem to be that team capable of defying the odds.
It's no surprise they pulled the trigger to acquire a player of Zucker's tenacity and skill, particularly with Guentzel out for the season following shoulder surgery. Zucker is fast, responsible in his own end and possesses a goal-scorer's mentality. He's going to be a good fit on left wing alongside Crosby where his job will be to play smart, anticipate and find ways to get the captain the puck at all costs -- much like Chris Kunitz did for nine seasons.
The Penguins gave up a lot, most notably Addison, an offensive defenseman with fantastic upside, but Zucker, who has 29 points (14 goals, 15 assists) in 46 games this season and scored 33 goals in 2017-18, has three more seasons on his contract and is worth the risk because he significantly improves their top-six. It wouldn't surprise me if the Penguins win the Metropolitan Division and make even more noise in the playoffs.