When news of the Pittsburgh Steelers trading for tight end Nick Vannett of the Seattle Seahawks broke on Tuesday night, the immediate thought among the Steelers’ faithful was Vance McDonald shoulder injury must be pretty severe. Seen in a sling around the locker room on Monday, many feared McDonald’s long-term availability would be in question. Between trading for Venette and the Steelers adding a third tight end to their practice squad in Alize Mackall on Tuesday, it was a natural conclusion to assume McDonald’s injury was a factor in the decisions.