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John H.How can anyone know if McGraw had nothing, a little, or a lot to do with Matty being the pitcher he was? They are linked because they were on the same team, they had a lot of success together and they apparently had a good relationship, not because McGraw "made" Mathewson a great pitcher.
Also, we don't have a clue how most careers are going to turn out when a player first makes the bigs. Some players are immediate stars, some continue to improve and become stars, many plateau and belong to the supporting cast, and some get injured or regress and drop out of the majors as big disappointments.
John