The Kremlin's Strategy to Find a Success of Putin

In 2015, you wrote a book called All the Kremlin's Man and you interviewed dozens of people at the Kremlin. You said then that there is no long-term strategy to find a success of Putin. Why has Vladimir Putin not groomed or named a success a very openly? Oh, he's really afraid of becoming a lame-dog. He thinks that once he has chosen, he has picked someone, he's not the real leader.