Alan Wells is the most underrated sprinter in history. His 'slow' times were in a period when nobody was running sub 10 at sea level.
Never achieved his potential in terms of times. Until Moscow, he NEVER used blocks. Ran 10:07 and 20:12 at the 78 Commonwealth games without blocks in his first season as a sprinter. Suffered a back injury in the weeks before Moscow and only decided to go at the last moment. Then told unexpectedly he would be forced to use blocks. Got off to wobbly starts in ever one of his rounds including the final, except for the quaterfinals when he coasted in 10:11 and most observers thought he could have broken 10 seconds. This was on the slow Moscow track.
In his career, Wells defeated the 72, 76, 84, 88, and 92 Olympic 100m Champions.
People forget that HGH came on the scene in the USA in 83, and suddenly every top sprinter was a sub 10 man. He was the best sprinter in the world in 1980.