Johnson and Martinez? No way! Maddux and Clemens, you could maybe make an argument. Johnson is easily rattled and has always been inconsistent. Of his era I would let Fergie and Seaver slide but none of the others.
I believe you mentioned Koufax in your original list and many make the comparison between the two, as Ryan broke many of his records and both were power pitchers.
Back on his win-loss record, in 87 Ryan lead the league with an ERA of 2.76 and strikeouts 270 at the age of 40. His record, 8-16. There is absolutely no doubt that he was plagued with crappy run support. His postseason performances were all solid but again he got screwed by his offense.
His last pitch, thrown with a torn ligament, was clocked at 98 miles an hour.
Nolan Ryan was the man. Tell me one guy that was more amazing to watch.
Some of Ryan's records
Most strikeouts, lifetime: 5714
Longest service: 27 years
Most no-hitters, career: 7
Most strikeouts, season: 383 (AL, 1973)
Most seasons, 200+ strikeouts: 15
Most seasons, 300+ strikeouts: 6
Most consecutive strikeouts, game: 8
Most low-hit (0/1 hit) games, career: 16
Most low-hit (0/1 hit) games, season: 3 (1973)
Most seasons leading majors, walks: 8
Most strikouts per 9 innings, season: 11.48
Most strikouts per 9 innings, career: 9.57 (as of 1990)
Fewest hits allowed per 9 innings, season: 5.26 (1972)
Fewest hits allowed per 9 innings, career: 6.41 (as of 1990)
Oldest to pitch a no-hitter: 44 (5/1/91)
Fastest pitch (as listed in the Guiness Book Of World Records): 101.9 MPH