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If, in August 2012, you've got Justin Smoak and Mike Carp sitting on (confirmed) .550+ SLG percentages -- themselves doing the basic LH damage that you need Fielder for -- then at that time a pricey 1B/DH is going to look different.
Agreed.
My question, then, would be what you spend your money on. Because if that occurs, you probably have a good 6-7 legit stars who are all in their first and second years.