The high of the 76ers’ first-round performance against the Celtics this postseason has quickly given way to a low against the Knicks. The 76ers are missing some bodies. This is not a unique problem in the NBA, as the postseason often puts a spotlight on the glaring holes in a team’s lineup. But the wound stings a bit extra for the 76ers right now because while they struggle to fill their playoff minutes, two of their former players are in the midst of breakout campaigns for other teams looking for a title. Two ghosts—Jared McCain and Julian Champagnie—are haunting the Philadelphia front office during this postseason, and in Game 2 against the Knicks those ghosts became impossible to ignore. Jared McCain was dealt at the trade deadline for basically nothing Thunder guard Jared McCain celebrates after a play against the Lakers. | Alonzo Adams-Imagn Images The 76ers selected McCain out of Duke in the first round of the 2024 draft.…