The top bWAR seasons for pitchers (not including the Dead Ball Era)
1. Dwight Gooden 1985 ... 12.2 WAR (24-4, 1.53 ERA, 2.13 FIP, 276.2 IP, 229 ERA+)
2. Steve Carlton 1972 ... 12.1 (27-10, 1.97 ERA, 2.01 FIP, 346.1 IP, 182 ERA+)
3. Roger Clemens 1997 ... 11.9 (21-7, 2.05 ERA, 2.25 FIP, 264 IP, 222 ERA+)
4. Wilbur Wood 1971 ... 11.9 (22-13, 1.91 ERA, 2.63 FIP, 334 IP, 189 ERA+)
5. Pedro Martinez 2000 ... 11.7 (18-6, 1.74 ERA, 2.17 FIP, 217 IP, 291 ERA+)
6. Lefty Grove 1936 ... 11.4 (17-12, 2.81 ERA, 3.77 FIP, 253.1 IP, 189 ERA+)
7. Hal Newhouser 1945 ... 11.3 (25-9, 1.81 ERA, 2.45 FIP, 313.1 IP, 195 ERA+)
8. Bob Gibson 1968 ... 11.2 (22-9, 1.12 ERA, 1.77 FIP, 304.2 IP, 258 ERA+)
9. Gaylord Perry 1972 ... 10.8 (24-16, 1.92 ERA, 2.50 FIP, 342.2 IP, 168 ERA+)
10. Randy Johnson 2002 ... 10.7 (24-5, 2.32 ERA, 2.66 FIP, 260.0 IP, 195 ERA+)
10. Sandy Koufax 1963 ... 10.7 (25-5, 1.88 ERA, 1.85 FIP, 311.0 IP, 159 ERA+)
10. Wilbur Wood 1972 ... 10.7 (24-17, 2.51 ERA, 2.99 FIP, 376.2 IP, 126+)
Pedro was more dominant when he pitched than any of these top performances relative to the league. He pitched much less though which prevents his season from being a runaway #1. And that is important! How much, opinions can vary here. One fun note, Pedro's 1999 season where he was scandalously robbed of the MVP - his FIP was an unthinkable 1.39. He had a 23-4 season with a 2.07 ERA ... arguably the best pitched game in Red Sox history ... and had the worst BABIP of any season where he pitched more than 20 starts. That season also included a game where he gave up 9 runs and got chased in the 4th inning by a 98 loss Marlins team. That registers as one of the weirdest "that's baseball!" sort of days ever https://www.fangraphs.com/blogs/how-did-pedro-martinez-get-bombed/