Was he the greatest... No; I have him #5 at heavyweight:

20: Riddick Bowe
19: Floyd Patterson
18: Max Schmeling
17: Ezzard Charles
16: Sammy Langford
15: Harry Wills
14: James Corbett
13: Sonny Liston
12: Joe Frazier
11: Mike Tyson
10: Lennox Lewis
9 James Jeffries
8: Jack Dempsey
7: Rocky Marciano
6: Evander Holyfield
5: Larry Holmes
4: Jack Johnson
3: George Foreman
2: Joe Louis
1: Muhammad Ali

I have him #42 in the all time list: (#) in comparsion to the last time I done the list (This list was finished 26/3/2006)

52 Ike Williams (N/C)
51 Mike McCallum (+2)
50 Battling Nelson (-7)
49 Felix Trinidad (N/C)
48 Nicola Loche (+2)
47 Evander Holyfield (+1)
46 Wilfred Benetiz (-1)
45 Khoasio Galaxy (+2)
44 Jose Napoles (N/C)
43 Michael Spinks (+3)
42 Larry Holmes (N/C)
41 Terry McGovern (-3)
40 Kid Gavilan (-3)
39 Azumah Nelson (+2)
38 Bernard Hopkins (+1)
37 Jack Johnson (-1)
36 Ricardo Lopez (-1)
35 Roy Jones (-1)
34 George Foreman (-1)
33 Joe Gans (-1)
32 Ruben Olivares (-2)