I didn't think there was enough info when I replied to have an opinion about when to repot, so tried to offer some general info about the plant to help you get to know it better. Looking at the 3 new pics, the last 2 look fine until spring to me. Can't see the pot/surface of the first one to have an opinion of when I might repot it. With enough info about a plant, its' owner could be able to make an educated decision of their own.
The only ways to kill a Sans (that aren't on purpose) are to rot it or freeze it, I've never killed one, so you won't hurt it, no matter when you think the time is right for repotting. If the pot is plastic, you may be able to feel bumps on the side, which would be a pup/new rosette that will have a tough time finding the surface in a confined space.
