In regards what? The cheeks will help turning, and keep the bit still in the mouth. The Dr B plate acts at an angle on the tongue and when pressure is applied it crushes into it.
Depends on the angle of the plate, shouldn't matter that the edges are rounded really. It might make it a bit softer but still a Dr Bristol and quite different from a french link. As regards the above bit meandmyself might be right, it does look rather like a french link, with the angle of a french link plate. Might just be the wrong piccy..