Pete Alexander certainly had a top peak. 1911-1920 he was 148 ERA+, 2.06 ERA and led the league in strikeouts six times in that period. Cy Young had unmatched longevity while never having a real "peak" but it's hard to argue with a guy who pitched 22 years and still had a 138 ERA+. He didn't have a peak because he was really, really good for 20+ years. Kid Nichols, yeah, it's hard because it's 1890s baseball, but they've done a great job digging through box scores and we have a pretty clear idea what he did. Lefty Grove absolutely deserves to be in the discussion. Walter Johnson is a no-brainer.
Those dudes are without a doubt not only top 50 but top 10, shit top 5.
I don't question the accuracy of stats from 1890 (ok, a little), the issue is that it was closer to semi-pro baseball than professional baseball. You had gambling, collusion, teams and leagues folding and teams skipping games. No, sorry, those numbers are in no way comparable to the modern era.
I mean, cripes, the foul-strike rule wasn't even adopted until 1901/1903. For Nichols and Young they played a couple of season before the mound was moved to 60 feet 6 inches.
Lets not forget that the American League doubled the size of the "majors" in 1901... (you know, Young's best seasons), without anything resembling a modern farm system. It can barely even be considered a major league at that point.
WAR7 (seven best years, not necessarily in order) all has them in the top 5. JAWS (7-year peak/Career WAR) puts Cy Young, Nichols and Alexander in the top 5 meaning they absolutely had "peaks" that are more worthwhile than you're giving credit for. Young, Alexander and Nichols are also both top 15 in ERA+.
Walter Johnson speaks for himself: 2nd in WAR (Cy Young is 1st btw), 1st in WAR7, 1st in JAWS. He's the best pitcher ever. Led the league in Ks 12 times, including 8 years in a row.
Of course those guys are going to rate well in WAR, which is largely a product of IP. When you are starting 40+ games a year and throwing 300 innings you are going to rack up counting stats.
No question that Walter Johnson is the most "greatest" pitcher of all time. That doesn't make him the best on a talent basis. Leading the "league" in K's 12 times / 8 times in a row is impressive, but I do feel it is an impressive as Pedro finishing first or second 7 times in 8 seasons (the only year he did not was 2001, injury shortened). Johnson played in an 8 team league, Pedro played in a 14 team league. Pedro played with a 5 man rotation, Johnson played with a 4 man rotation. Pedro had to beat significantly more people for his "titles" than Johnson did. I have Clemens finishing 1st/2nd 10 times.
Just a thought of mine from CCS on a similar subject(Position players not having to play against black pitchers):
I guess I'd apply it to the Pre WWII white pitchers as well. yeah we missed out on seeing them pitch against Josh Gibson but over the sample size of their careers...would it really have made that much of a difference or would they have not pitched as well against them? Plus it could have helped them too with better fielding players behind them possibly....
You're asking the wrong question. The issue isn't that "black players wouldn't have dominated," the issue is that the general talent pool would level out.
It's a silly premise anyway,
1) Since 1946, # 1, 2 and 3 in offensive WAR are black and 7 of 10 are minority.
2) 7 of the top 10 HR hitters of all time are black
3) In career OPS since 1946, #2, 3 and 4 are minority
So yes, they have dominated the game.