Before the Kings traded Jack Johnson and a conditional first-round pick to the Blue Jackets back in February, they were the lowest goal-scoring team in the league. They needed a proven scorer, and they also needed someone who could provide depth. Enter Jeff Carter, apparently now the jewel in the crown. Despite Carter’s impressive regular season numbers — he led the Flyers in goals his last three seasons with the team and has had four 25-plus goal seasons in the NHL — his playoff performance has always been questioned. In Game 2 of the Western Conference Finals, Carter made a …