Hero Splitting

I haven't encountered this, but WBN says he had it even with computers. I was also told about a game with bots.

Have you really figured out the save structure so well that you can make such statements?

The structure is quite simple - it's object-based.
There's a hero object, its parameters, including coordinates.
There's a castle object, which includes whether there's a hero there.
There's a map in the save file, where the positions of the heroes should also be indicated.