The plus-minus system in hockey is an outdated metric to evaluate player performance and the Detroit Red Wings, including Lucas Raymond, are a great example.
The plus-minus stat gives a player plus-1 if they are on the ice when their team scores an even strength or a shorthanded goal. On the other hand, players are given minus-1 if they are on the ice when their team allows an even strength or shorthanded goal. Power play goals scored for a team do not count toward plus-minus.
The Red Wings were more of an anomaly last year. They were simultaneously outstanding on the man advantage and absolutely dreadful on the penalty kill, yet the plus-minus system did not reward them for their efforts on the power play.