I would add the forth border for continuity. I like things to reflect all sides to match. I get my quilts twisted some times and I like to t find where I am at from time to time. This quilt is to die for beautiful!! I was closely looking at each of the elements and it is amazing how much you have put into this quilt. To not finish off the last border would somehow be sad IMO. I can understand how tired I get this close to the finish line but it will be worth the added efforts.