No it is NOT all about the horns section at all. If slipknot got a horn section would they be playing ska? Hell na, so why do you thin ka punk band with a horn section is ska? Your lucky I don't have the time to go off on a tangent right now, but I've said it all before and don't have the time now. SO look here instead
http://musicbanter.com/showthread.php?t=5639