Espinosa's ISO decreased from .179 to .155 in 2012. Mostly due to his stint in the #2 slot in which he had 2 extra base hits and a .053 ISO. I think the "drop in power" is being grossly overstated. He had 56 extra base hits in 2012 which is 1 more than he had in 2011. Strangely he had the exact same amount of plate appearances.