i learned somthing new, the wider the tire the worse the traction (as i roll my eyes)
All else being equal (and, as others have pointed out, all else is not necessarily equal) the size of the contact patch is a function of the vehicle weight and the air pressure in the tire. At street tire pressures, a wider tire will have a wider but shorter contact patch.
Usually, that provides better cornering grip - if the suspension design can keep that wider tread flat to the pavement. This is a traditional problem with Macstrut cars, they need to run a bunch of static negative camber in order to avoid rolling the outside tires over onto the sidewalls in corners.
Whether or not a wider tire produces better straight-line grip is another question, and one that's more dependent on tire construction and air pressure than on tire size. Drag tire construction is a special case that doesn't necessarily apply to street tires.
Corvette comparisons are also of limited value, because the Z06 has a rear-biased weight distribution, greater power-to-weight ratio e.g. more throttle-steerability, and is targeted at a market where ride quality is less important.
The point that should be under discussion is how big a front
tire you can put on a CTS-V without clearance problems, and without destroying the steering feel, because in the end, for a road car, particularly for one like the CTS-V that's supposed to be a comfortable daily-driver, and that is at least slightly nose-heavy, you have to maintain balance even at the expense of ultimate grip.