I don't think this discussion matters anymore since the screenshots are probably fake.There are GCN games with way better texture resolution. So that's really a non issue. Just because a developer can't make proper use of the resources, doesn't mean the system is at fault.
If you look at this screenshot
http://www.wii-gamer.nl/images/screenshots/fc1.jpg
You can see a faint second crosshair in the center of the screen under the helicopter.
Someone with way too much time and poor photoshop skills.