DUDE! The eyepatch man is back! He’s alive… after getting wiped the heck out by the sonic fence!

So how come the smoke monster couldn’t go over the top of the sonic fence like Kate, Jack, Locke and Sawyer did? How come Kate, Jack, Locke and Sawyer could even go over the sonic fence? Wouldn’t the designers have a tiny clue about the little gap between the booms? All that tech and they leave a hole that big and that simple? Huh?