None. He never devolved that much power to subordinates and kept them fighting for his favor. It was one of the ways he kept a tight grip on power. The inner circle of the Nazi party was chaotic, not very well qualified, and very disorganized. In fighting and intriguing against each other were common.

Some people were considered favorites to take over, but his closest inner circle angered him in the last weeks of the war by pushing negated peace so he named a relatively obscure (politically) admiral as his successor in his final testament written just before his suicide.