Uhm, no. An entity is an entity, and isn't defined by a core. You can/could create an entity via file editing or whatever that is just a docker, and it would still work... or replace the ship core with whatever block via file editing and the ship would become un-enterable, but (bugs aside) nothing would really change.
Just because you can go into folders and edit files doesn't mean it is part of the normal game mechanics. Those are hacks and workarounds. The core is the normal way entities are spawned in and moved around during game play. If you need to leave the game and start tweaking a file with other software before an entity doesn't have a core then it's pretty much dependent on the core. . . but you get bonus points for nitpicking.
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