What skills are important for a cornerback on SP? And what role does a CB actually play on SP?

The same questions for a gunner, btw.

ooh men I had a whole page written explaining on how these position work in football. When I tried to post it I got a database error due to a update. ppff do not feel like typing it again and the above reply explains correct and enough.

One note. The Cornerback is moreover called a Anti-Gunner. Gunners and Anti-Gunners are position filled by Cornerbacks. A Gunner is not a special position in the team.