Best gear for a wedding
16-35mm f2.8
28-70mm f2.8
70-200mm f2.8
Now, why in the hell would anybody want to take on a wedding with the slower 18-55 and 70-300mm lenses as they are slower than molasses and you're screwed if you can't use flash.
Now if you shoot with one lens...a 50mm f1.8, all your shots will have that same look to to every picture. What sets a pro from everybody else apart is the quality lenses in the bag and the knowledge of shooting a wedding.