Why Leonov Aleksey could not return from an outer space

Why Leonov Aleksey could not return He the first left an outer space in an outer space and so became history of world astronautics. There was no Leonov Aleksey from the well-known first group of our astronauts. Person Obayatelniyshy and most talented in much spheres. Russian character. To what Leonov Aleksey remains in our memory? .