Should I rank USC?

I have a low chance of matching to USC anyway, plus they only match 5 people. I also have heard that you need your QB AND Commonapp. I am ranking 15 schools so I don't think I have time to right another WHOLE ahh essay as I am going to be busy with the 14 other schools. Should I still rank it or is it not worth it? (its #2 on my list)