He's below these people (in no particular order) -
Matthew Centrowitz Jr
I was thinking about how he compares to Webb (only considering the 1500m/mile).
Webb is the high school record holder in the 1500m and mile. He broke Jim Ryun's 36 year old high school record in doing so.
Spivey won the NCAA 1500m championships in 1982.
Webb has a faster 1500 and mile PR than Spivey does and is the current american record holder in the mile.
Spivey was a 3 time Olympian, though only two of those occasions saw him contest the 1500 meters (1984, 1992). He made the finals on both occasions and finished 5th & 8th. Spivey was also a member of the 1987, 1991, & 1993 world championship teams. He made the final in 2 of those championships ('87, '93) and finished 3rd and 5th. Spivey has a world championship bronze medal for his performance in the 1987 world championships.
Webb is an Olympian (2004). He was eliminated in the first round of the competition. Webb was also a member of the 2005 and 2007 world championship teams. He made the finals on both competitions and finished 9th and 8th.
Spivey was world ranked by track and field news over the 1500m/mile 7 times. His highest ranking was 5th, which occurred on 2 occasions. His rankings were 9 ('84), 9 ('86), 5 ('87), 7 ('88), 10 ('91), 9 ('92), 5 ('93).
Webb was world ranked by track and field news over the 1500m/mile 2 times. His highest ranking was 6th. His rankings were 7 ('05), 6 ('07).
Webb posted the fastest 1500m and mile times in the world in 2007.
I'd say Spivey deserves the higher ranking.