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Doc...just to answer one of your questions...I haven't seen evidence in those 70s Orioles' teams of the great fielders having their best years in separate seasons. For example...Brooks Robinson's good seasons:
1966-1975 he went 2.7, 3.9, 4.6, 4.0, 2.1, 3.0, 3.8, 3.7, 2.6, 3.1
How about Belanger (1968-1978): 5.0, 4.1, 2.8, 4.5, 2.6 (90 G), 5.9, 4.7, 5.8, 5.8, 4.2, 3.2
No correlation at all...positive or negative. They were just good with some variability every year.