Walker caught 21 passes for 344 yards for 3 TD's in the regular season. But he was the target 39 times. Does that mean 18 drops or are some of those bad passes?

Whereas Vernon Davis caught 41 passes for 548 yards and 5 TD's. He was the target 61 times.

Tony Gonzales caught 93 passes for 930 yards and 8 TD's. He was the target 124 times.