Ray Lewis Calls Jimmy Graham a Queen Tight End!!
I believe he was indeed referring to a chess piece. He was making a distinction from a "traditional tight end" who would mostly block and stay in-line, but could also catch in a pinch. Here, Graham is a "queen tight end," as in chess-queen, i.e. can be moved all over and do different things, though he cannot block like a traditional one. Take the good with the bad if-you-will.