The quantitative bounties found in Fangraphs linear weights help us understand most of the who, what, how, or why certain things happen on the field. It is important to remember that pitch values are not a predictive stat. They value what occurred on the field, as a result of specific pitches thrown but should not be used to attempt to predict the future. In the game of trying to guess what will happen, from a pitching standpoint, we suggest looking at players' SIERA or xFIP, as ERA predictors, or their K/BB ratio in a simpler sense.
Without further ado, as of the morning of June 3rd, here are the pitchers with the best "stuff" of the season, by Fangraphs pitch type linear weights.
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