Dumbledore's thought backs on mistakes, fears and his students: Lupin, Sirius, James, Harry, Riddle. And the Mirror of Erised, he used to see a himself holding a pair of socks but what about now?

Remus, lost three of his best friends. He sits in the dark staring. So, is he back where he started? Before he attended Hogwarts, when he had not friends? The answer is no.