Furst may guard the 5 but TKR will be our main low post scorer unless berg or DJ somehow emerge as better (I don’t suspect that to be the case).Furst is not and never was a 4. They tried to make it work because he had a certain someone in front of him till his Sr year. Didn't work that well as witnessed by last season.
He'll play center and probably start unless Jacobson can play D too.
I don’t think it matters who the 4 or 5 is, as they will be interchangeable with those 4 mentioned.