If there's a point where my suspension of disbelief is violated, it's that such a large piece of the Death Star made it intact all the way through the atmosphere, and that it didn't create a massive crater where it landed. Assuming this is new space age material that can resist atmospheric reentry and survive the impact, the size of it puts it on the same level as the meteor theorized to have wiped out the dinosaurs.
Do we see an extinction level impact on Endor? No.
https://en.wikipedia.org/wiki/Chicxulub_impactor
Why would it not survive entry through the atmosphere? Displacement aside it wasn't orbiting anything and just sat out in space relative to a planet, and Chicxulub was estimated to be around 20km/s on impact alone, not it's full speed. Do you think this fell at + 20km/s?
It likely did make a crater, it's just so damned big and in a body of water to you know, fill it up.
Suspension of disbelief is one thing, not understanding why things break up or not in the atmosphere is another.
Things don't just burn up entering just because, it's because of friction at high speeds. The shuttle/soyuz capsule does this because the only way to stay in orbit is to reach high speeds and the only way to slow down it so use the atmosphere as a break. Made of materials likely way inferior to this sci-fi/sci-fantasy settings.
Speaking of which, parts still remaining from the Columbia accident, some almost fully intact, pieces that are incomprehensibly smaller than a deathstar, entering the atmosphere at about 3600 times slower than Chicxulub. Why are you even comparing an asteroid to .....this?
