post #473043: no.
Posted under General
size_difference is widely used as height_difference right now anyway, so there's a lot of cleaning to do (and not from me, at least not now).
Nuking it and restarting would likely be worse, since there wouldn't be another tag pooling all those images together. At least having them mixed up gives us a place to start with cleaning. In short it's easier dealing with them already in a pond, than having to fish them all up again from the ocean.
edit: Of course this is dependent on if there is or isn't another tag which is encapsulating the images. If the images go back to ground zero, that's much harder to work with than dealing with something that at least has a foundation.