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This move IMO has less to do with Figgins and more to do with Lopez, the thinking being that he'll be a better fit at 3b as his career progresses. Maybe it's even something where Lopez splits time at 3b this season, then moves over there full time later.
I also buy Sandy's contention that a defensive focus improves the mental acuity of the team as a whole. And I think that having Lopez work on fielding 3rd will encourage concentration on his part, since it's a challenge and not as comfortable as 2b for him.