Gravity is a function of mass, not spinning.
The ring can be attributed to a once molten state as it spun on it's axis in the sky. All the heavy and hard molten material would accumulate on the equator. After it cooled, this ring would contain a concentration of the hardest material of the shperes makeup, and erode the slowest.
The shape of the craters is indicative of the material the object is composed of. It's like a crystalline pattern. Ever see columns of basalt with 5-6 sides and near perfect geometry, same idea here. The material makeup could have a high concentration of Cobalt, Beryllium, Magnesium or any similar element with the rhomboidal or hexagonal type atomic pattern. This same geometry due to physical makeup of the moons material accounts for the horizons having some straight edges that are not as rounded as what is typically seen.
This thing is comprised of a heavy concentration of something like basalt that exhibits these angular characteristics. Nothing surprising at all, different yes, anomalous, yes, when compared to everything else we can see. Improbable, not at all.
Deathstar, well, let's hope not. Looks like liberal arts college students aren't the only ones smoking the good doobie. A spaceship, wow, good herb man.