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Seen at Bill James Online, in the "Hey Bill" section:
I always thought that perhaps Weaver's system worked, but not necessarily for the reason people thought it worked. Weaver collected outfielders, first basemen and DH types, occasionally catchers and third basemen, with severe limitations but identifiable strengths. . .left-handed .320 hitters who couldn't run, right-handed power hitters who couldn't throw, short switch-hitters who walked every day but struck out twice. He rotated these players based on matchups, true, but he might have been equally successful if he had rotated them in and out of the lineup by pitcher height, hair color and biorhythms.
And, by the way, that system would work better now than it did then.
The enormous expansion of the bullpens since the 1970s has trapped in the minor leagues dozens of the types of players that Weaver worked with, the two-dimensional outfielders. It's a lot easier to find those guys now than it was in Earl Weaver's day.
This is an interesting insight. In the 1970's, teams ran 10- and even 9-man pitching staffs. Now you see 12-man staffs and, correct me if I'm wrong, but haven't there been some 13-man staffs at times?
The difference between a 10-man staff, in Weaver's day, and a 12-man staff nowadays, well, that's the difference between a 6-man bench and a 4-man bench. But! Hold on now - you've got to have a backup catcher and a backup shortstop. So you're talking about four bench players vs. two.
It hadn't really occurred that we're talking about half as many jobs for the Carlos Guillens of the world. Maybe 50% of the 1975 Carlos Guillens in Major League Baseball are now in the minor leagues?
Read more about Guillen as a Weaver-Style, January, Replacement Level Player