rotators are there to promote valve rotation, in other words typically they don't move on their own. At least not very well. A performance set up should not show signs of valve rotation in my opinion. Take lash caps as an example they always show even radial wear, that's because on the seat they bouncing all over the place with lash. That being said if valves show signs of turning and nothing is getting broken it's not the end of the world either. But if keepers are cracking in two, rockers are cracking, valves dropping, I bet there is signs of valves spinning/bouncing. Just evidence something isn't happy.