We already saw Xebec's no name smash slicing GV in half. Whitebeard could tilt islands as collateral damage. Most likely we don't see much DC in their combo attacks because Oda wanted to display focus damage(on Imu).
		
		
	All these attacks looked weak because Imu is just that powerful.
 
				 
 
		 
 
		 
 
		 
 
		
 
	 
 
		 
	 
 
		
 
 
		
 
 
		 
	 
 
		 Is this your point???
 Is this your point??? 
 
		 
 
		