In discussing whether to bring up Jordan Westburg, Colton Cowser, etc., we often hear statements like “even very good players usually struggle initially, with very rare exceptions.”  I spent some time today testing that statement. For my study, I looked at all 20 players who debuted in 2017 who have  been worth at least 5.0 rWAR in their  career.  Originally I was going to do 2018 as well, but this was time consuming so I decided just to do one year for now. For each of the 20 players,
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