So basically Bill James thinks Roy Oswalt is the most "clutch" pitcher of all-time? Interesting.
That's not what the series of articles is about.
It's about defining what constitutes a "big game" in terms of the regular season then compiling the performance of the starting pitchers in all "big games" since the '50s. The "big game" definition is based on how late in the season the game was, whether the team was in a playoff race, whether the opponent was also in the race and the quality of the opponent. You're playing your division rival in September a few games ahead or behind, that's the prototypical "big game," but the definition also includes other games that you might consider "must-win" for a team in contention.
It turns out, when you look at the records of all starting pitchers since the '50s in "big games," James thinks Oswalt comes out on top, just ahead of Bob Gibson:
"And no, I am not just being provocative. Gibson’s won-lost record in regular-season Big Games was 36-14; Oswalt’s is 37-9. Gibson’s teams were 40-17; Oswalt’s were 46-12. Think about it: 46-12 in Big Games. Gibson’s ERA was 2.26; Oswalt’s was 2.63. When you adjust for context, I suspect that Oswalt wins that one. Oswalt pitched 80 fewer innings than Gibson, but struck out almost as many batters (341 to 352) and walked half as many (73 to 144).
"In certain ways we are not as good at making myths now as we were a generation ago. The Wild Card system DOES create more Big Games, I believe, but sometimes it creates Big Games for second-place and third-place teams. The story lacks the clarity and symmetry of a pennant race; it is a harder story to tell.
"Roy Oswalt won a tremendous number of Big Games for the Astros in the mid-2000s, but when there are six pennant races to follow and two Wild Cards, things get lost in the shuffle. Oswalt’s constant drumbeat of Big Wins late in the season didn’t have the impact of Bob Gibson winning 7 games in September of ’64. But . . . just the facts. Oswalt has won 80% of his Big Games. Wow."