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I think it demonstrates that the M's only have 3 prospects with a good chance of being average MLB position players or starters. I also think it demonstrates that many have decided that Walker has the highest probability of being a top of the rotation starter in the bigs of all the M's pitching prospects short of Michael Pineda.
Sure it underplays the fact that he has a higher chance of never seeing AAA than he does of pitching in the all-star game, but prospect watching is, in large part, wish-casting.