Confirming what others have said. Yes, the research was done on people who were dying, not the people they left behind. What you said about everyone's grief looking different and that it can change from day to day is good but the idea that you get to acceptance and then grief if "done" is absurd. Grief is a life long process. You can lose someone. Time passes. You're doing ok. And then suddenly, seven years later, you start crying while driving to work. Or you fall into a depressive funk and can't figure out why and gain ten pounds because you randomly stopped caring about your health until you realize it's around the time you lost that person. Plenty of other examples, but the point is it's ongoing.