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I agree with this 100%. You can't throw Tilleman into the conversation on one hand and then with the oth hand say that the approach that the O's used to develop him is invalid.
The other thing you can do with a pitcher in AAA is that you can't do in the bigs is force-feed in-game practice on certain pitches. Want Maurer to learn a splitter? You can make him throw 25 a game in Tacoma, results be darned. You can't do that once he's wearing a major league uni.