It all works. 5 fins, 6 fins, 7 fins, 2 small fins, no fins... Its just a matter of making adjustments to your style to get the best out of your setup.
Here is a pic of my "Zoolander" which has only 2 small fins - the outside rail fin (its for right hand points) is similar to that bonzer styled fin.
Here is a pic of my optional 7 fin board. This pic is set up as a 6 fin with very small fins. These DVS fins are actually the same as what I am using in the previous pic (but on the inside rail). This 6 fin configuration had just been used in solid 6 foot JBay last year and yes it did work.