Randy Moss is not a leader. He doesn't deserve to be the captain of the Oakland Raiders. He's the one who said he wanted to be traded. He's not happy. His effort is lacking. That's a disgrace to the uniform. I don't care what uniform you have on.
Metaphor. . . is, as a common feature of linguistic practice, an incidental expediency, a homely administering of first-aid by mother-wit to jams or halts in expression suddenly confronting speakers, with no respectable linguistic solution immediately in sight.