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I'm not a fan of this if its permanant. If its to increase versatility than Ok..
Mostly its because I'm one of the believers in Figgins' improving D at 3B, and don't want to switch him to a position where hes less effective and more likely to re-injure his hamstring..
There are some quotes I'd need to search for about Figgins improving his defensive technique at 3B over the past two years, but I believe his defensive improvement to be absolutely legitimate and its not just because of his UZR.
Lopez, on the other hand, might gain a little moving to 3B. I just do not believe its worth the tradeoff of moving Figgins in the short-term for no/negative defensive gain and simultaneously hurting Lopez' trade value.