I just watched that Greedo BD shot. I think the subtitles move way too much. It's more of a distraction and you notice the subtitles instead of the scene.

I honestly don't see why they need to move. You use the BD shots (or other sources) to have the best quality, clean shots. So your work is like a restoration. In a restoration you would also fix any subtitle problems.

So to have them added intentionally, is no restoration and if you are not doing a restoration, you should not use the clean BD or HDTV sources. Why not add grain and scratches and hairs?