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It's not only about him not being able to learn more in MLB. That's not the point. The point is: Is the 2 month jump-start worth the increase in salary that will come with it?
My personal opinion is "no". Because if we bring him up now, we will pay him more for all of his 4 arbitration years, in which we can use the difference in salary to improve 1-2 wins in each season, while also having a team more likely to contend than this year's Mariners.