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The way I would couch the issue is that the M's appear to hold starting pitchers to a fairly rigid standard for command and mechanical reproducibility before promotion. That is why Erasmo gets to pitch in the Bigs and Paxton doesn't, even though Paxton may get similar quality results. In short, all starting pitchers have to reach a certain level of craft -- roughly independent of 'stuff' -- before they will be on the big league roster. You don't get to refine your release point in the Bigs even if you could get big leaguers out while doing so.