From my observation:

Cats tend to gulp down wet as well as dry food. The only time I have seen real 'chewing' is on pieces of raw with bone where the cat has its side of face parellel to the floor and uses its back teeth to 'chew' through sinew and bone to masticate off the meat. If there is no bone/sinew and piece small enough the cat tends to swallow it, or if too big it may bite it to a more manageable size.

Some kibble is really big - RC Maine Coon comes to mind - then I think there is more chance of crunching.

This is my observation only.