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Tejada and Soriano had a lot more natural power than Lopez does.
Their HR/FB% are literally twice as high and their HRs average 400ish feet.
Lopez has really good power for a middle infielder, I just don't think hes a 30 HR guy. 20-25 HRs is the upper end for me for Lopez in a really good year (I think he'll sit in 15-20 HRs most years), but he'll get some doubles as well.