It seems to me you picked a bunch of stats simply because they are the easiest to collate and compare, checking things like completion % against would have just taken too much work…

If you want to see how good a job a corner is doing just look and see how many passes come his way. Look and see how much help he gets, how he holds up in single coverage. Check the number of TD’s he gives up, look at the completion % accross the range of passes. There are a whole host of other things to look at with the most important, as someone mentioned earlier, is on film.

One more point, I could just as easily say the reason other positions picked up int’s is entirely down to QB’s not wanting to challenge the corners, so let’s give them the bulk of the credit…