First, you need to be aware of directions being on a globe. You can't have a plate expanding or contracting in all directions away/toward a pole. Remember that a continental craton is going to stay roughly the same size. If you have one at a pole and it is moving, it will be going north on one side, and south on the other. The ratio of continental to oceanic crust stays pretty much constant.

If it helps, don't think in terms of linear movement, think in terms of plates rotating about the centre of the planet as that's a more accurate view of "strait line" movement on the surface of a sphere.

So you can't have an all land planet which ruptures open a ring shaped ocean around the equator. A supercontinent at a pole, does work if you want it, and it would likely result in severe cooling and sea level drop IIRC.

Also, your coastlines look far too 'rough' and 'fractaly'. If you look at a map of Earth you'll see it tends to have a much lower fractal dimension with just a few 'rough spots' like South East Asia. Large rough spots like that tend to be shallow continental seas. If you look at it more zoomed in, you see more variation in roughness, but not so much with continents.