Never noticed a gap.
But we have Radians and the seats fit with room to spare.
Now that I think about it, toys get lost down there, lol. At first I thought wide-mode was just a way to be closer to the door, and why be closer if you don't have to? OK, fine. But then with 3 in a row, I realize wide-mode will make it possible to get my Frontiers once they outgrow the Radian. So I like it.
What I don't like is the fancy seats that move this way and that, durability-wise. Our captain's chair BROKE within a few months. They had to totally repair it as it would not slide at all. Brand new van.