No, the flat does not cook faster than the point. In fact, it is the other way around, and the point cooks faster than the flat. When you begin cooking a brisket, the entire thing will often be very tough. But, the point will become tender a lot quicker than the flat.
Generally speaking, if you cook a brisket without separating the flat from the point, you can just leave the point to fend for itself. The flat is the piece that you will be eating, so it is very important that you keep your focus on this piece of the brisket throughout the process.
So, no, the flat does not cook faster than the point. The point will become tender a lot quicker than the flat. So, it is very important that you focus on the flat when you are cooking brisket.