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Couldn't tell ya Taro, except that by default a converted 2B is presumed to be a plus 3B, given that he has enough arm to play there.
You also have James' principle that defense is primarily work ethic ... a principle echo'ed by Zduriencik last week re: Ackley. Even if a rookie's defense isn't good, he can *become* good.
If he wants to. Which is the rep, at least, that Seager has.