What I've been told you get a shorter more realistic yelp hinged in the middle. When its hinged in the corner the yelp is a little more dragged out in the front and it looks like the way the sides cut in on the lid it allows the paddle to close more. Darrin didnt just design it to be different theres a reason.
Well said talking with TJ Johnson he told me that design is a pretty involved call to make, harder than a two sided call. If you guys want to hear one designed that way go to TJs Facebook page he has a video of a smoker on his page in that design.