Questions about sprite organization

[bluecake]

I'm currently ripping assets from some PC games that already have their graphics arranged as sprite sheets. However, as far as I can tell the order of the sprites doesn't necessarily match up to the in-game animations, and some sprites may not be used (in the attached example, I haven't found a way to trigger the sprites that are completely blue in-game). Would it be acceptable to upload the sprite sheets as they are, or should I reorganize them / remove any sprites that appear to be unused?